Yea Forums explores portal physics

the problem is specifically about a portal whose entry and exit possess different velocities

Attached: 74887468674.png (1188x470, 250K)

You get your head ripped off obviously.

you cannot move a portal on a surface. there is nothing to discuss, none of this is possible within the realm of the game it is from, you might as well ask if the train will come out of the portal covered in ketchup.

according to B logic, 10m/s

>lets discuss portals and how they work but you have to discuss my own version of portals and not the official one that has been discussed for years and if you don't I will sperg out about the premise of the thread being my own interpretation of it
ahehaehaheahe
>specifically about a portal whose entry and exit possess different velocities
impossible, since entry and exit have the same velocity and nowhere it says that the problem is about that

stop twisting reality

what the fuck is this layout
If the choice is between A and B, why does B have an "or" with a different choice?

Does the orange portal move, or is it at 0m/s?

0m/s.

>entry and exit have the same velocity
Where does it imply that? From the diagram I'd say the exit is sitting still

in the image the orange portal is moving downwards a Xm/s while the blue portal move at 0m/s
their velocities are different
that is the premise

>B apologists would literally get their head chopped off by some magical pull because they thought their entire body would get rocketed into the air

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who cares its a video game ya nerds

>Where does it imply that?
Its implied when you use portals, since that is how portals work.
>that is the premise
that isn't the premise, since there are portals and both portals move at the same speed at any given time

>gravity
>magical

an object in motion stays in motion. The problem here lies in the fact that portal technology is impossible, let alone a moving portal. If one portal is moving and the other one isnt, I imagine the object would be destroyed upon attempting passage.

but in the image their velocities are clearly different from each other

>gravity
>launching people high in the air
B apologists ladies and gentlemen

Because according to B's logic the momentum of the orange portal is transferred to the cube. But is it transferred only to the parts of the cube that are going through and pulling on the other parts or is the whole cube affected at once?

>their velocities are clearly different from each other
they aren't since portals always have the same speed, not my fault you are clueless about portals :^) keep fuming boy, you've been wrong all this time and no amount of denial and reposting is going to change that

What? Portals dont move together in synchrony. As said, it's not moving at all.
>that's how portals work
Dont you dare imply there's complex scientific analysis of a portal system in a videogame and that we can base anything off of more than assumptions and anecdotal evidence.

>Portals dont move together in synchrony
They are the same entity. If one moves, so does the other. They are literally a hulahoop separated in space.

The portal decelerates before the person is fully through. It would effectively be the same as bungee jumping, just dipping into the portal, which does not support your argument.

I'm afraid you're the one denying the premise that's right in front of you

Yeah I'm afraid you are denying the premise that portals work in a certain way. Keep fuming.

>that is how portals work.
Not in the game, even if we ignore the obvious cases of rules breaking for plot convenience. If you can have linked portals at different heights, they move at different velocities.

anyone not saying 10m/s is a retard

If instead of a cube there was a person and the answer is B that means that person's blood would go all to his head?

Kek

But in the image one portal is moving and the other isn't
that's simply how it's set up

>Not in the game
It's literally how the portals work. They are one single entity connecting two points in space. They behave exactly the same as eachother.

>one portal is moving and the other isn't
both portals are moving since that is how portals work, keep fuming

When there are two portals, there are two worlds. Both the same world but offset from eachother. Each object has a position in its original world, and a relative position in the portal world. When portals move, stop thinking about the movement of objects and start thinking about the world behind the portals and how they are moving relative to eachother.

Wasn't there a moving portal in portal 2? Just pretend the portal is on a surface and that surface is motorized and moving along the track

Reminder that if anyone mentions Einstein in these threads, you should be laughing at them.

wheels are spinning for 20 though

Portals aren't real, and in the example, only one is moving.

>in the example, only one is moving
factually wrong, since one portal is moving so is the other, keep fuming

if the portals don't have the same direction and velocity, then everything going through them would get destroyed on travel

This is correct.

>if the portals don't have the same direction and velocity
portals always have the same velocity and direction, even when one of them is apparently motionless it's just how portals work

No it doesn't what the fuck, where are you even getting this information. According to the code, the scene is drawn twice with a stencil. It is not a fucking hoolahoop

but the blue one isn't moving

>but the blue one isn't moving
the orange is, and both portals move if one is moving, keep fuming

This is how you answer the op. It's all relative. It comes out at 10m/s and is going in at 10m/s relatively so it all works out.

We can even ignore that scene. The portal on the moon is definitely not moving the same speed as its linked portal on Earth. And we can ignore that too, portals at different heights on Earth move at different speeds.

If you drive a car going 60 onto a ramp on the back of a truck going 50, you don't go 60 and fly off it.

Attached: calvinrecord.jpg (800x260, 29K)

It clearly has "movement waves" or whatever. It's going 10m/s. The train is moving 10 m/s relative to the other moving object. Therefore the train is only moving 10m/s faster... so 10? Non-physicist logic here

Wouldn't it basically be like going from a conveyor belt to a stationary floor? I would imagine the train would come out at 10 m/s but it would basically be skidding on the exit side until more of it gets through, while on the entry side it's still gripping, but slowing a bit because of the other side. I think it'll probably end up fine and slow for a while to around 10ms in total, maybe less once the track in the entry side starts to essentially pull backwards, but eventually grip the track and keep going.

Attached: 1556244800906.png (750x650, 64K)

it's clearly not moving

This. If you made an animation of it it would be clear as day that it comes out at 10m/s

>it's clearly not moving
it does, since that is how portals work and this is a problem about portals, keep fuming

You're being trolled just move on

The vehicle will emerge completely from the orange portal more slowly, but it will neither accelerate or decelerate in speed.

Come on give us a hard one

No because it's going in at relatively 10m/s as well. It would come out at 10m/s with none of the other issues you are talking about.

>trying to argue real world rules of physics that clearly don't apply here since it is fictional

I don't know, that guy has been going on about his portal headcanon for an entire thread, i think he might be serious

Given that the orange portal is stationary, and ignoring friction, the train will come out of the orange portal at 10 m/s until it has exited the portal where it would resume traveling at 20 m/s

This, just take the relative speed and that's the answer

Because the train is staying in motion, it will eventually catch the portal. The portal will not slow it down, however, because the train is technically moving in an unrestricted straight line. All that will happen is the train appearing to slow as it enters the portal, but it will maintain speed as it exits.

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The answer is 20 because trains move with engines and not momentum. The engine isn't going to slow down because it went through a magic tunnel, the second the wheels hit the track on the other side it'll maintain it's speed relative to the ground.

>actually believing you are not being trolled
how new? these threads are unironically 99% of trolls trolling trolls trolling trolls trolling trolls

no, in case of OP's they don't
imagine this, you're going through a door frame, and the frame goes with you at the same speed, you would always be under the frame. If the frame suddenly stops, your body would cross the entire frame immediatly.
in the case of portals, if the out portal goes in the opposite direction, then at the moment you "spawn" outside the portal, half your body would be spawning particle by particle at a different rate, losing all connection with the half of your body that is still under the first half of the frame

I'd say yes but he continues to say, "keep fuming" which makes me thinks he's fucking around

While it may emerge relative to the orange portal at 10m/s, the speed of the train will not change. instesd, the traveling blue portal will simply trail behind the front of the train, making it take longer to fully emerge.

>doorframe
stop breathing doorframefag

Correct answer

/thread

if that were the case, I think the front of the train would begin to pull the rest of it along and accelerate the pre-portaled part to a speed higher than 20

The solution to this problem is impossible, as the train cannot be both 20 m/s and 10 m/s simultaneously. The train would be exiting the portal at 10 m/s while the rest of the train is at 20, eventually causing a crash. If the train returns to its initial speed immediately after exiting the portal, then the train would break down at a molecular level, as in an instant the first atom slows, then speeds up, there would be a separation from it and the following atom. Even if there were no issues with molecular separation, the train would still be crushed due to the massive amount of energy required to change speed instantaneously. TLDR; 0 m/s

literally the only person without a single digit IQ in this thread

>The engine isn't going to slow down because it went through a magic tunnel,
Yes it has to actually in this event. And that's why talking about portal physics is fucking stupid. It already breaks a rule that you can travel a distance with 0 time so naturally trying to extend this to other hypotheticals is going to break shit.

>fuming so hard it won't respond
#schooled

There's a second where both parts of the train are accelerating at a different rate, thus causing the train to break
Portals can't move in order to work

>what is inertia
>what is momentum

The train would probably collapse on itself if it halfs its speed in a matter of a milisecond. The backend of the train will probably either derail or crush itself, anyone INSIDE the train will probably be thrown or smashed.

>The train would be exiting the portal at 10 m/s while the rest of the train is at 20, eventually causing a crash
Wrong, relative to the portal it is entering at 10m/s. There would be no crash.

You think you're right but you aren't.

Explain in at least 200 (two hundred) words how the train would go at two different speed when the motors keeps it going at exactly 20mph

Why do people keep forgetting that portals can't be placed on moving surfaces?

They can in the games, you're just denying the reality that portals are not real and acting like your headcanon is fact. Keep fuming.

>relative to the portal it is entering at 10m/s
Relative to the portal it is exiting at 10 m/s but relative to the GROUND it is moving at 20 because the portal is moving but the GROUND IS NOT

Portals still obey the law of conservation of energy, emerging from a portal does not add energy ie increase the objects speed without the assistance of gravity.

This thread is exactly why. Because things clearly begin to break down once they do

Actually, what'll happen is that the wheels, which have angular velocity [whatever], will hit the rails and get forced down to angular velocity a little bit over [whatever]/2, but then the engine will keep pulling, gradually accelerating the train back up to 20 m/s.

This post is the most correct, but the loss of velocity would likely be much smaller

sauce

Don't forget that portals also move equally as fast and in the same direction at all times. If one moves so does the other. Anyone disagreeing with this is a fuming retard.

To move your head at a higher speed into the portal, you'd have to come in diving with some momentum. While it would have to be a very high speed for more egregious consequences to happen, it would still take a good amount of force to stop you at the shoulders/neck if you dived into the portal with great speed, so effects would present themselves.
As to whether your head flies off or your body gets pulled along... Either way, it would be unpleasant. I'm not too good at this part and I'm sleepy desu, but I think it'd be a bit of both

The difference in velocity is 10m/s, so the train hits the portal at 20-10=10m/s. The nature of portals means that the relative speed it enters is the speed it exits. Any increase or decrease in energy along the way no longer renders it a portal. So the train must exit at 10m/s.
The problem is: not only is the ass end of the train (before it hits the portal) going faster than the front end (exiting the portal), the speed of the train as it hits the portal has dropped instantly. Since F=ma, where a is m/s/s, and the second s is 0 (instant change), travelling through the portal creates infinite force, thus destroying the universe.
Which is why portals can't move. Or, they must move together in the same direction at the same velocity.

>emerging from a portal does not add energy ie increase the objects speed without the assistance of gravity
A-fag brainlet spotted.

>B apologists say that if I point my dick up while a portal goes down on it my dick grows 5 inches
let it sink

FUCK HOOPS
FUCK HOOPFAGS
FUCK DOORS
FUCK JANNIES
FUCK BRAINLETS

Attached: HOOPS.jpg (810x1080, 369K)

>b apologists

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but since the portals moves at the same time, direction and velocity, the analogy works

>The moon isn't a moving surface

People seriously don't believe it's A right? You can't be this retarded right?

So long as the train keeps moving faster than the portal, it will not collide with itself. Because the “train goes slower” option seems to break the laws of reality itself, and the “train goes faster” option does not account for the added energy required for an increased speed, the “train remains at the same speed “ answer is most likely to be correct. Of course we can’t experiment this to prove it, so the discussion seems to end here

>Emerging from the portal doss not add energy ie increase the objects speed without the assistance of gravity
Read up on potential energy. Being magically transported from the ground to some height above the ground IS adding energy.

at what point does the blue portal move?

All these A-fags calling B-fags 'B apologists' and the likes remind me of people who think they're scientists because they watched some pop sci youtuber debunk retarded people

whenever the orange moves since they are the same entity we just don perceive a physical movement

based

>what is relativity

Go through a hookah hoop that is standing on its side. Did it make you go faster?

Finish high school, or explain how emerging from a portal that is perpendicular to the ground adds energy to the object. Or give an example I’m the games where emerging from a moving portal increases your ground speed without the assistance of gels or gravity

imgur.com/a/IYOWC

Hello hoopfag
please see

Not in a way that increases the objects relative velocity

Relativity is the key to these questions

>hookah hoop
A-fags can't even fucking write properly. Really makes you think.

but the blue portal stays in the same spot

Nigga now am I supposed to go through a little ass hookah baka Einstein was wrong

>Relativity is the key to these questions
like any of you know what the fuck relativity has to do with anything in these questions

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>Relativity is the key to these questions
this
These images are the same
A car passes someone at 60mph
To the driver the person passed the car at 60mph
Both statements are true

Attached: portals.png (912x400, 64K)

>he made a typo! The laws of physics have changed now!

correct yet still it is moving relative to the orange portal

here's the first pic of the album in case anyone skips this link.

i don't claim to know anything, i just found this album and i'm presently reading it.

Attached: 0Paxo.jpg (600x1192, 79K)

Relativity IS the key, yes, but it's the key to understanding that an object moving into a stationary portal is equivalent to a portal moving towards and engulfing a stationary object, meaning it's their RELATIVE velocities, the thing that stays the same regardless of your reference frame, that actually matters.

yeah
When you drop a hoop do both sides move in the opposite direction? or in the same direction at the same speed because they are attached?

As soon as the train gets one wheel through the other side it will accelerate out of it at 20ms regardless of what is going on outside.

>i can't even write properly but you have to trust me about the extremely difficult and convoluted matters about physics and relativity
keep fuming

The very basics of it, enough that you can explain in a 6th grade class, should suffice.

Speedy thing goes in, speedy thing goes out. Moving portals do not add energy to an object in such a way that it will increase it’s ground speed unless it is harnessing gravity as well

in the same direction, exactly like the portals
if the orange portal goes down, so does the blue one relative to the orange one making portals nothing but glorified hulahoops

You still have to refute the point to be correct.

How does the train increase its overall speed of 20 m/s because it exited a tunnel. There is no in-game example to reference, so you’re going to have to use some kind of law of physics, which you have not

>The blue portal goes down relative to the orange one
then how do they get closer together?

The state can not be determined until it is observed. It is both 10 and 20 m/s. If only observed before the blue portal the train will go 20m/s. If it is only observed after, the train will go 10m/s. If both portals are observed the universe starts to rip in half, oops.

>what is auto correct

This is the most brainlet defense I have ever seen

>Yea Forums explores portal physics

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>Hoopfags

Attached: afags.png (1182x768, 48K)

>then how do they get closer together?
they are always together, they are literally the same entity

So if the question is measuring the trains speed relative to the ground, wouldn’t it still be going at 20 m/s, after accounting for the amount of distance it “skipped” via the portal?

same poster as above, if anything were to be true and if the universe didn't rip in half then the final answer would most likely be 10m/s but i have no idea.

There is not force being applied to the cube, nice b8 retards tho.

>they are literally the same entity
Okay, then how does each opening of the same portal entity get closer to eachother
A hoola hoop is one entity but you cannot move each opening around like the portals

t. thinks we're in space

this is all nice and cool until you understand that entrance/exit velocity is the same, thus giving but immediately stealing acceleration as the cube goes through

Yes, this is why you can’t place portals on moving objects in the game. This thread explores the concept of “what if you could”, to which the answer is “half of Yea Forums shits itself because they can’t into elementary physics”

>What is momentum

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What the SHIT is that comic?

>how does each opening of the same portal entity get closer to eachother
because it's the same entity separated in space, similar to how you can get the twon endings of a springy together except that portals have no spring cylinder connecting them

Define "non moving object"

>Starting at 20 m/s relative to the ground
Is irrelevant. The only factors that decide the speed coming out of the portal is the speed relative to the in-portal, which is 10m/s., and the speed of the out-portal relative to the ground, which is 0 m/s. Moving portals do not generally conserve momentum in any reference frame.

Yes, I think in space a moving portal actually might accelerate something. I never realized this. Gravity zero-sums any momentum gained by a moving portal.

I'm not sure you know what momentum is when you don't understand what entry/exit velocity is.

okay so here's what we've established
>A portal is an entity made up of 2 holes
>These two holes are seperated in space
>You can move them about freely relative to eachother like a slinky
does this sound right to you?

>hoop fags thinks we're not in space

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Calvin & Hobbes my dude.

this entire thread proves just how fucked western education is

seriously, especially you americans, need to do something about this bullshit

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While the train emerges relative to the exit portal at 10 m/s, that portal is mov Mg at 10 m/s relative to the ground. 10 m/s+10m/s is 20. The train itself experiences no increase in speed relative to itself or the track.

I'll give you a hint seeing as how you're stuck:
It's not just an equation you input your values into.

Hmm, what if the train got as deep into the portal as it's first large window, but then the portal sped up to 20 m/s?

Normally I chose "a" for this portal question with the cube and the moving pistons but this one has me stumped with my own hypothetical. In that case it seems like B is the more logical choice, that the relative speed between the portal and object are what would matter.

Keyword is "would" you spergs, this is all speculative anyhow.

What would happen if you had two portals moving apart from each other at the same speed?

after reading the whole album, this last pic makes sense to me.

so if it goes by apparent speed, then i guess the train would come out the orange portal going 10km/h
makes sense, since the blue portal is moving at a rate which would ensure the train wouldn't fuck itself while exiting the orange portal ""slower""

Attached: weTDo.jpg (600x1002, 61K)

>does this sound right to you?
No.
>A portal is an entity made up of 2 holes
A portal is a single entity period. The two holes are not two holes. It's one hole. People are adamant in considering it two portals and two holes when both portals and both holes are one and the same.
>You can move them about freely relative to eachother like a slinky
'They' move in the same way at all times. If one of the two portal moves, so does the other one because it's literally the orange portal too. Even if it doesn't appear to move physically, it is doing so in space.

So what’s the right answer, European master race? Educate the barbarians

You dumbass

Attached: Solved.jpg (724x361, 35K)

The exit portal is stationary, check the picture again.

You guys should really not forget that acceleration is not speed.

Since the other side of the portal doesn't move, it acts as ground, just like standing on ground while dropping a hoop on you. So the analogy works.

portals don't accelerate anything, ever
objects "leave" the exit portal with the same resaistance the rest of the body of said object has
your head doesn't go flying off upwards when you jump, right? even if it's weightless in your case, it's still connected to things that have a lot of weight... let me rephrase that, your head is connected to a body that is kept together by the same atoms, independently of gravity, friction, innertia, etc
any small "acceleration" caused by any of the portals at any moment at any rate would destroy everything that passes through

I'll give you a hint since the one stuck seems to be you.
If the entry/exit speed is the same, there's no momentum.

Sorry my wording was incorrect
>It's a single hole with 2 ends/entrances/etc.
>You can move each end independently
that better?

Afags have been so thoroughly, definitively blown the fuck out by so many webms, infographs, MSpaint images and SCHOLARLY SOURCES that arguing with them at this point is punching down.

>Since the other side of the portal doesn't move
If the other part of the portal didn't move you would actually shoot up. It's the fact that it moves that makes it like a hulahoop.

>There is no momentum
That's it. Hoopfags have officially lost it.

nigger what?

I think in space things might change a little bit considering . We need a real physics student or something for space related questions

>doesn't understand why he is wrong
>HOOFAGS HOOPFAGS
lmao you don't even know if what I'm saying defends the hoopfags or the B apologists

wouldn't the "ground" be the platform the cube is on?

>reddit boogeyman

>A moving particle has no momentum
Hoopfag Education at it's finest.

10 m/s

This is the correct answer, brainless can all go home now

the portal would become a solid object

>portals don't accelerate anything, ever
Cube suddenly stopping after completely leaving the portal would be negative acceleration.

>still not understanding entry/exit velocity
lmao this is sad

things change in space, since if the enter portal moves towards the cube, then the cube wouldn't leave the exit portal, not moving at all
and if the cube is the one moving towards the enter portal, then it would leave the exit portal in a straight line at the same enter speed in the same direction indefinetely

>the train and the portal have the same arrow above their heads

I think you need to check it, user

>The Earth isn't a moving surface

Real physics student here.
The only thing I can think of that being in space with flat spacetime (i.e. no gravity) changes is that you can no longer gain arbitrary amounts of energy just by placing the portals cleverly, since there's no potential energy difference with position.

Welcome to the hell that is defining relativity

all this thread is less clever than me

Attached: undisputable b is correct.png (1930x1298, 29K)

>I won't even try to work up an argument I'll just claim that a moving particle has no momentum without anything to back it
HOOPFAGS EVERYONE

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>things change in space, since if the enter portal moves towards the cube, then the cube wouldn't leave the exit portal, not moving at all
What

The moment the question goes beyond 10th grade science this whole fucking website starts to break down

Not him but the entry and exit coincide you dumbass. Both contribute to forward momentum

I hope you're not color blind because I'm not going to reiterate this again

The BLUE portal has rest frame velocity 10 m/s
The ORANGE portal has rest frame velocity 0

The TRAIN at the start has rest frame velocity 20 m/s

The RELATIVE VELOCITY between the train and the BLUE portal is 10 m/s

The rest frame velocity of the train coming OUT of the ORANGE portal must also be 10 m/s.

So what if the portals "tear your head out" if they're moving? Is that the argument against B?
Because then that means that one argument tries to make physical sense of the situation, while the other tries to make narrative sense.
If the laws of physics should dictate that your head is teared off should a moving portal approach you, then that's what going to happen, even if you don't want it to be that way because it sounds gruesome or doesn't sound logical.

Attached: 1461126924549.png (381x326, 142K)

you can get around that by suggesting that portals cost energy to create and therefore can supply a finite but arbitrary amount of energy to handle the transactions of potential energy and momentum

Afags are incapable of thinking about the atoms and the mass that make up a single object, until you ask them how the object appears to be emerging from the portal with active momentum to suddenly stop. Then they just say "THE ATOMS WERE SCRAMBLED BRO THAT'S WHAT PORTALS DO" not realizing that if that hail mary shit were true then portals could never conserve momentum no matter what

>entry and exit coincide
>both contribute to forward momentum
so you are saying that a hulahoop indeed accelerates anything that goes through it then? lmao
you people are so easily to bait into agreeing and disagreeing about things you know nothing about

I expected this post from the guy that was replying all salty but I'm fine with this outcome. Wait a moment...
>not him but
perhaps I got what I wanted after all

lets assume we're talking about vacuum here, without gravitational forces of the objects that hold the portals applied and it's the portal that is going in the direction of the cube
the cube would appear at the other end of the portal without moving at all, since no energy is being applied there
the atoms in the cube aren't changing their acceleration at all, and the thing would just stay there, touching the exit portal with one of its sides

>so you are saying that a hulahoop
Stopped reading. A portal is not and will never be a hulahoop. I've explained why so many times and you have been shown in so many copius ways why this is not true that the second you enter the fucking word "hulahoop" with your keyboard you are an invalid shitposter.

Stop trying to argue with hoopfags, it's a lost cause.

>Stopped reading except I didn't because I actually read everything and I realized you outed me like a clueless parrot
Yeah seems about right

These arguments are all moot and everyone is wrong because "portals" aren't possible. You are all making assumptions based on equations that are missing pieces.

>hoopfag calling anyone a clueless parrot
In the face of the mountains of evidence that now exists that portals can in fact impart momentum, you're still going NNNOOOOO THEY'RE JUST HOOPS. What's the benefit in arguing with you? You'll just say "nuh uh" forever and pretend you're being profound.

>Ummm, don't you guys know that like, portals aren't real?
You're the biggest type of retard in these threads. Afags and Bfags at least try to have fun. You're an outright black hole of knowledge.

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>the cube would appear at the other end of the portal without moving at all
The cube doesn't suddenly appear at the other side, it's slowly moving through it, so yeah the atoms are moving while passing through.
>he atoms in the cube aren't changing their acceleration at all
So why does it stop after completely passing through? That's still acceleration, albeit in a different direction.

>without gravitational forces of the objects that hold the portals applied and it's the portal that is going in the direction of the cube
I hope you're high as a kite because this is some mad shit.

Because of the 10 m/s difference in speed of the portal and train you would assume the train coming out of the portal would be moving at 10 m/s but the back end of the train will still be trying to move at 20 m/s so unless the train is indestructible is will crumble on itself like an accordion.

>the exit portal is stationary

Are you suggesting that it is moving relative to the ground or not? I thought the diagram was asking “what happens when a train enters a portal moving down a track at 10 m/s?” Isn’t that the word problem here?

it would tear itself to shreds.

Correct. And that conclusion supports B.

>what is a thought experiment

Thought experiments like this are the basis of nearly every important question of physics

That is not what relativity means in this case retard. In case you never realized, which is as obvious as your low IQ, those pictures are not applying the same forces onto the cube.

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>STILL calling me a hoopfag
you have no idea how extra clueless you look calling me that lmao seriously it shows the nonexistant knowledge you have about anything I said so far
it's a little sad 2bh

hoopfag baby gonna cry?

Does the game suggest that moving-portals tear things to shreds? That would obviously explain why they can’t be placed on moving objects

this guy is right
trolls>>>>>>>>>>>>>>>>>>bfags>>>afags>>>>>>>>>>>>>>>cesspool>>>>>"guys portals ain't real"

Should we ask /sci/ to offer their expertise?

What's a "moving object"

>fuming so hard it respond in a matter of 30 seconds
lmao keep em coming

well the only thing that comes to mind is your adding momentum while subtracting momentum from other areas of the object while its trans-versing through a portal.

the concept of the event horizon of a black hole comes to mind.

>Pretending that you're busy and waiting to reply
Actually pathetic, as expected of a hoopfag

WAIT
what if the Train is bigger than the Portal hole?

the atoms that "move" to the other side, are still connected to the atoms before entering, and have zero momentum on them, the whole structure is balanced at every step of the pass through. Otherwise, the object wouldn't keep it's shape

So, there is only 10 meters of train entering the portal per second, but by momentum, the train should be moving in relation to the viewer, at 20m/s
This is a relativistic question, and the train obviously is stretched so it fits both situations at once. Remember that the portal gun works with black roles, so spaghettification is not outside the realm of possibilities

Attached: stretched.png (500x500, 21K)

You exit the portal moving at your velocity, 20m/s.
Then your body drags the rest of you on the other side of the portal to this side at 20m/s relavtive, so if observed from the side of the blue portal, you measure at 30m/s. This is only the observable speed, but not the actual speed. Portals don't care about your relation to anything else, it just transports the thing that went through instantly.

black holes*, holy shit i need to sleep

>Pretending that you're busy and waiting to reply
Lmao I'm literally doing nothing but monitoring the thread the fuck you on about.
That sounds more like a projection than anything. Keep boiling :^)

I've created a new universe, it's called Plortal, it's like Portal except the portals can be placed on moving surfaces.

Now shut the fuck up.

Attached: file.png (493x402, 8K)

In perfect conditions the front side would start at 10 and slowly speed up as more of its mass gets past the portal

But really the front wheels are always moving slower than the back wheels so the train would almost immediately derail from the compressive force its applying to itself

The blue part of the portal is moving relative to the ground, the orange part isn't, meaning it has a velocity of 0 when compared to the ground.
How is this basic part of the question so hard to understand for you?

Attached: file.png (250x80, 14K)

The portals are connected to the portal gun.
Thus, as long as all three are relatively stationary it's fine.

Portal 2 isn't canon.

>I changed the premise of the thread to mi will
lmao this is the same guy as the last thread for sure

Generally thought experiments don't involve trying to apply high school level of physics knowledge to an object which disobeys the most basic laws of physics. It's not a thought experiment. It's just an exercise in futility.

Portals can't move. That one part in Portal 2 isn't actually in-game, and is a simulated animation.

Actually, wouldn't it never matter how fast the train was moving? Both sides are moving at the same velocity relative to the ground. It will continue to move that same velocity no matter how shit the blue portal is. it just moves through the portal at half of its velocity, but it's velocity as compared to the ground/itself never changes.

>Im smarter than both sides because of a contrived gotcha

at least Afags have an argument

Not equivalent unless you can instantaneously change your momentum by passing through the top of that cup.

Imagine trying to respond while using a Wojak. Way to show how much of a brianlet cuck you are

/sci/ is no better at this than Yea Forums, the afags there are just as retarded but more arrogant about it, the bfags still have the right intuition but struggle with high school physics, and anyone who tries to bring in terminology beyond high school level is still thoroughly ignored, even if they spoonfeed it in portions the size of a "hurr portals aren't real"-fag's brain.

Imagine you are looking through the blue portal. You would see a cube rushing at you at extreme speed only make a complete stop with no outward force applied.
Imagine you were looking through the orange portal. You would watch a cube with no motion suddenly fly away. I believe the first option is the correct one, because the cube would be subject to the motion perceived from the participant from the blue portal, because that is the "area" in which it would be ending in.

So they are moving, but why are they suddenly stopping? Where does the acceleration come from?

what about the train tracks?
The fuck is going on with them? A train cant, you know, do the whole train thing without the tracks.

How does the train interact with the tracks while its going through the portal, or how does the tracks interact with the ground, or how does the trains inertia interact with the sudden shift in speed while its going through, its long as fuck and its drive system can be both in front AND the rear of the train, so its power delivery to drive it at such speeds could get fuckey.

My hypothesis is everyone dies and there is a massive explosion. In that order.

>Seething so much you can't even check your own post for spelling mistakes
Kekking over here

why would I need an argument when I come here to laugh at the autists lmao
>smarter than both sides
considering how both sides are sperging about the most pointless shit ever I couldn't agree more with that statement

>He doesn't know about magnetic railing

fucking magnets, how do they work?

The implicit assumption is that the tracks perfectly line up through the portal

The only portion of momentum that is affected in Portal is the direction of velocity. A portal doesn't add or reduce the magnitude of the object's momentum. This is absolutely equivalent

That's for another thread.

>By momentum
>This is a relativistic question
You win the award for worst dunning-kruegerposter in this thread so far.

The last few times I was in one of these threads, you retards ("A"-tards in particular) were trying to tell me that motion isn't relative, that physics problems must be solved only using the frame of reference in which the Earth's surface is stationary, that gravitational potential energy doesn't need to be taken into account in conservation of energy, and even that momentum isn't really a vector. So fuck you brainlets. You're too stupid to grasp the most basic concepts, so I'm not even going to try to have a conversation with you.

I'm sorry, I don't follow the claim you are making.
Additionally, that was a picture to explain a different scenario, as long as we are clear on that.

The velocity change from going through the portal will always occur before touching the tracks on the other side, so in effect the front of the train is moving at 10 when the wheels have the rotational momentum to move it at 20

Though I guess if Im going with that premise the engine would just snap off whatever is hooking it to the rest of the car as soon as the entire engine car is past the portal, assuming the engine car doesnt snap itself in half from the force of the first wheels crossing the portal.

Based B-Chad.

they aren't moving in the same way objects move in a X Y Z axis
the atoms are just teleporting to the other side, with no energy being carried from the entrance, other than the one these atoms have
if the portals were actually moving you, everything would get sucked in in both directions, breaking everything at a molecular level, instantly
if the portal was actually moving every atom with a new acceleration, then going back through a portal wouldn't work at all, and everything, again, EVERYTHING would get split in half as soon as it touches any of the portals

What happens if the orange portal is pointing down, falling downwards at 100 m/s, while the blue portal is pointing up and stationary on the floor, and then you drop something into it so that it passes into the blue portal at 10 m/s? If your model of portal behavior applies, it should come out of the orange portal in a downwards direction at 10 m/s, which is slower than the 100 m/s of the orange portal, meaning the portal passes the object as it emerges.

Which portion of the velocity equation is being affected by the portal. The only right answer is it's direction. A portal doesn't have the capacity to impart magnitude/speed to any object without using some other thing as a helper.

Can the effect of gravity be transferred by a portal? If a man stood next to a blue portal, and a hyper dense object was placed next to an orange portal, would the man get pulled through?

Attached: 1551536633849.jpg (640x451, 46K)

Instantaneously altering direction of momentum is just as impossible as instantaneously altering it's magnitude. The energy required to alter momentum approaches infinity as the the time period of the change approaches 0. There is no "distance" between two portals, so the something entering one immediately exits the other with a different direction, and therefore a different momentum.

gravity is a particle, so why not?

To be fair, SOME of those are just observations of canon portal behavior. Relativity denial isn't one , but portals do explicitly violate energy- and momentum conservation in the game.

Kill yourself

everything is moving,we are rotating with earth, the earth is rotating around the sun, the sun is rotating around a fucking giant black hole

Yes, that's correct. Until the Orange portal came to a stop, slowed down to 10m/s or less, or you placed the blue portal somewhere else, you would essentially be trapped, constantly falling through the Blue portal at 10m/s, but then be passed by the Orange portal, reaching an impass where you can only move as far as the height of your body before gravity on the blue portal side brought you downwards again.
I guess there would be a portal speed in which you could out speed it by approaching terminal velocity, but this isn't something I'm confident in tackling.

make my bosons go first

The top picture. If you were looking into the blue portal, from your perspective you would see a cube moving quickly toward you, but given what the picture depicts the cube would suddenly stop moving without any external force applied.
If instead you looked at it from the perspective of the orange portal, it would look perfectly normal; an unmoviing pole and an unmoving cube.

The bottom picture, this time looking through the orange portal. You would watch the cube suddenly launch itself off an un-moving platform. If instead looking at it through the blue portal, you would see a pole pushing the cube out of the blue portal, and once the pole stops moving Newtons first law takes effect and the cube continues on it's course.

Since any idiot can see that the second picture is correct, we can assume that in order to discern how the cube would react we need to look at it from the perspective of the EXIT (blue) portal, because that would be the relative reality (area) that it would end up in. Therefor, the first picture is incorrect.

>the atoms are just teleporting to the other side
Okay, the first layer of atoms teleports to the other side, what about the next layer? Where does it go? Does it push the first layer? How can the whole cube appear on the other side of the first layer of atoms doesn't move away from the portal? And for the third time, what causing the first layer de-accelerate after the whole cube passed through the portal?

I think you mean the force required to alter the momentum approaches infinity, the change in energy going through a portal is just the potential energy difference, unless the portals are moving relative to each other, then the kinetic energy also changes, but still by a finite amount.

This is the correct answer.
Since the train's engines are making the train move at a certain speed, entering a portal that's moving at any speed won't suddenly change how fast the engines are moving the train along.

And the erratic motion of the black hole perfectly counteracts it all so that the orange portal is the only truly stationary thing in the universe

I mean to alter momentum, you need to apply force, and to apply force you need energy. Since a portal alters momentum by the very fact that it can change your direction, it must apply force, and therefore energy, to you. Since your direction changes instantaneously, it must apply infinite force, and therefore infinite energy, to you.

But that would mean that the train is entering the portal at one speed relative to the entrance portal, and exiting at a different, faster speed relative to the exit portal. At that point either the train rips itself apart at a molecular/atomic level, or the mass in the front exerts some kind of force on the mass in the back by using whatever properties hold the mass together.

the first layer of atoms is "pushed back" by the same principles that hold items together... do you think atoms in solid objects are actually static?

That's exactly what will happen, given the proper materials. There block emerging out of the blue portal has velocity by definition. Putting it to an abrupt stop will cause it to decelerate down to zero this putting it under an immense amount of stress.

Remind me to never cheat off of Yea Forums during a physics exam.

Or you just go with the glitch-free version where speed relative to the portal is the same going out as it was going in.
In this case, the object comes out of the orange portal at 110 m/s. The only physical laws broken here are the ones portals already break in their game.

I cannot believe, honestly, How you fail to see how you have created a false equivalence. Portals do not add magnitude to an objects velocity. The only reason scenario 2 happens is that the portal is being explicitly assisted by the pole going through with the cube. The pole is exerting force on the cube, not the portal. The portal isn't even exerting force on the pole.

The portal exerts no force on the cube in scenario 1. Since Gravity only gives potential energy downwards, and it receives no other energy when it is moved by the portals, it doesn't fly off.

Movement is entirely relative. There is no God View of the universe from which relativity doesn't exist, because you would see every object moving at different time-speeds.

You're taking this question as if it was modeled out of a fucking videogame where an object is a single entity.
These are real physics in play.

Oh so there is movement. Now imagine the whole thing except the last layer moved through the portal. The last layer teleports through but there are all the other layers moving at whatever speed the portal was moving at and pulling the last layer with them. Where does the major de-acceleration come from?

Do I need to make it any simpler to you? If portals cannot directly affect any other portion of the velocity equation besides for direction, it cannot change the speed something is moving at relative to itself, or to the Earth. To the train, and to the Earth, the train has always and will always move at 20m/s. There is nothing the portal can do on its own to change this fact. since every portion of the train is moving at 20m/s, it won't derail from inconsistent speeds.

Portals do not, in-game nor in story, obey the laws of physics as we see them.

So your point is that the movement of the entry portal has absolutely no effect on the behavior of objects moving through it, and behave the same as two stationary portals?

If they can change the direction of an object's motion then they're applying force to the object. What specifically prevents them from changing the magnitude of velocity if they're applying a force to the object?

>To alter momentum, you need force
True
>To apply force, you need energy
Kind of true, but not in the way you're phrasing it. An infinite force applied for an infinitesimal amount of time is actually how you model perfectly inelastic two-particle collisions classically, but there's no infinite energy involved. You get divergent amounts of force when you hit a potential barrier where the change in potential energy to pass it would be infinite, but that's not the same as saying a discontinuous velocity implies infinite energy has been transferred.

You agree that scenario 2 is correct? That the pole gives force to the cube, and once it stops moving the cube continues to move. The issue is that from the perspective of a person only looking through the orange portal, the cube did not move at all, and then suddenly "jumped" off the platform. It may help to imagine the pole pushing out of the blue portal as little as possible. Say in the example given the portal was pushed out 2 feet. Would the same effect (the cube jumping off the platform) happen if the pole stopped only 1 foot out of the portal? What about 1 inch? 1 micron? What happens to the cube as the lim of the distance slowly approaches 0? If scenario 2 is correct, then what happens in scenario 2 must continue to happen in all scenarios no matter how far the pole exits the portal, when if the distance is infinitely close to, and including, zero. In fact, even if ONLY the cube exited, the parts of the cube that did exit would still exert force on the whole.

Afags have had it right all this time, yes that is what I'm saying. If a portal came at you and you let it rush past you, you wouldn't skid on the ground. The same can be said of any direction it came at you. As long only you go through the portal, and you weren't being made to move by some force prior to being moved by the portal, you won't move except to be affected by gravity.

The speed of the train relative to the portal is 10m/s, so it will initially emerge that 10m/s.
There may appear to be an imbalance that would cause the train to crush itself, with the 20m/s rear colliding with the 10m/s front. However, note that, from the perspective of the orange portal, the world, and the train, is receding at a rate of 10m/s (or approaching at a rate of -10m/s).
20m/s + -10m/s = 10m/s.
An issue to note is that the wheels themselves will have a sudden change in the relative speed of the tracks passing underneath them, which could cause mechanical issues or a derailing.

>looking through the portal
This isn't how any of this works

>parts of the train moving at different speeds

yeah no, that's totally not gonna wreck it

Portals aren't inelastic collisions. My point was that the cup analogy was invalid since portals are a hypothetical object that violate conservation of energy and momentum.

>chog choo

Attached: 1557848275771.png (1360x768, 300K)

Are you implying that you can't look through portals, or simply couldn't understand what I was saying?

Why do people say portals aren't real?
I thought worm holes were agreed to be a physical possibility, albeit small?

>btards actually believe this

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Mathematically, they could exist, but so does the non-zero probability that running into a wall will cause you to phase through it per quantum mechanics, so what the fuck do we know.

The moment something pass through the portal, it start generating momentum, just because the other portal stops moving, doesn't mean its moment stops

Attached: old movie.gif (350x267, 374K)

the atoms are still contained by the same magnetic forces that keep objects together

THE CUBE IS NOT MOVING
THE PORTAL IS MOVING
NO MOMENTUM IS BEING TRANSFERRED TO THE CUBE
HOW ARE YOU PEOPLE THIS RETARDED

So does an inert object going through a portal slamming into it have the momentum of the portal transferred to it or not? I can't see how the object would have any momentum transferred to it since the portal leads into empty space. It would be like putting a cup over a ball sitting on a table.

Attached: 1556566346491.png (501x622, 384K)

Then how does it move?

>afags

Attached: facts&logic.png (1002x626, 29K)

The train interacting with the ground needlessly complicates this

Attached: cubelaw.png (1038x1578, 29K)

>The moment something pass through the portal, it start generating momentum
Test chamber 09-11, GlaDOS' dialogue. Not my own thinking, not fanfiction, this is literally from the game itself and is therefore canon to its physics.

Attached: 09-11.png (1097x53, 11K)

That force can be overcome pretty easily, any time you rip something, you're breaking bonds. If the moving portal is moving slow, i.e. generating less momentum on the object moving through it than gravity, then the cube doesn't move.
If the moving portal is moving moderately, the cube will fly out the exit portal.
If the moving portal is moving incredibly fast and then stops before touch the base, the cube would be ripped in half.

Well yeah, but the force is still applied. Just because the molecular bonds are stronger than that force doesn't mean it doesn't exist.

they cancel out, that's the thing
so in a way, they don't exist

A moving portal is momentum dumbass, the exit portal doesn't care if it's the object moving or if it's the entrance portal. Momentum into is preserved out the exit

That was a line in relation to stationary portals.

This is why real teleporters are a bad idea.

>stationary portals
there are no other types of portals in Portal, trying to assume that portals add momentum or create momentum is fan-fiction and based on your own untestable theory.

Imagine that, instead of a cube, you are standing on the platform, with the blue portal rushing down towards you. In front of the orange portal is a hammer, immovably fixed in place.
Will your head hurt when it comes in contact with the hammer? No, because no momentum is transferred, right? The hammer certainly has no momentum, right? And you, standing still as the blue portal approaches, have no momentum, right?

>A moving portal is momentum
Source please.

No, they don't cancel out. Throw a punch with a relaxed hand. when your arm stops moving, your fingers will move forward, but the molecular bonds in your hand will keep them together. The thing is, you can still FEEL the force, and it will still move your fingers. In essence, if the molecular bonds in your fingers were weaker than the force you applied, they would fly off. same thing applies here.

Take a physics 101 and it should make sense.
The cube moving out the exit portal has mass and velocity, if that momentum is greater than the forces of gravity/friction being enacted on it, it will move.

You have no momentum but you are crushed because of the sudden lack of space.

ez

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>Take a physics 101 and it should make sense.
I didn't realise theoretical portals in space were fully covered and realised in basic physics, thanks user for this information!

Attached: dudetrustme.png (500x300, 42K)

I'm sorry you're a brainlet who can't understand basic principles of physics

Afags literally getting destroyed every single damned thread.

no, because the cube isn't moving in the same direction when entering the portal, in fact, it's stationary
your fingers aren't suddenly being teleported to the end of the length of the arm that throws the punch, they are being carried and pushed by the rest of the arms
in the case of the portal, the atoms aren't being pushed by all the rest of the atoms in the cube's structure, but only those which are suddenly materializing at the exit

I don't remember the part where the portals fly off into intergalactic space as Earth moves away from them. Was that DLC?

Everything relativity Bfags say makes complete sense but at the same time A feels like it would be the most "right" situation in terms of the portals.

Let's break it down then, retard.
>The cube moving out the exit portal has mass and velocity
Makes sense, sure
>if that momentum is greater than the forces of gravity/friction being enacted on it, it will move
Hold up, what force is being applied to the cube now? The portal isn't actually touching the cube because portals aren't physical, they're more-so just tubes in space.
Where does the fucking force being enacted on the cube come from, then?