Ragebait answers only
neither, no portal rules were given. Please create an Aperture support ticket.
You can’t put a portal on a moving platform, it has to stop moving first, so neither can happen… Unless the moving surface is a celestial body at least the size of The Moon, I guess?
What!? What if the platform is a train on Earth?
Was going to post the correct Answers (A) but then looked at the post and though na. But if you want to know more about portals and how they would work in real life check this out. Great guy.
and his answer: https://optozorax.github.io/portal/?scene=speed_model
Everyone else is wrong. (Ragebait.)
Speed of approach = speed of separation.
If the box left the blue portal at a slower speed than it entered the yellow one, the top of the box would be moving slower than the bottom of the box, which would compact the box dramatically during the transition, but we can see that its size is unchanged and it is still square.
The top of the box is pushed rapidly out of the blue portal by the bottom of the box being thrust into the yellow portal. (The bottom of the box is pulled rapidly up into the air by the top of the box which is already moving quickly.)
The top of that masher is clearly protecting the cube from the rain, so I’m not sure how the rain is expected to shoot the cube out as in option B.
A.
It should be a.
Imagine if the cube was actually a long rod and the orange portal start with the column half way inside it. Then the orange portal moves, in this case it would be very odd for the rod to jump in this scenario like in case b, the thing you would expect would be for the rod to stay still (besides tipping sideways a bit) consistent with case a.
If you considered the cube to be 1m^3 , the time at which the cube enters the orange portal t1, and the time at which the cube fully exist the blue portal t2, then the speed of the cube relative to the world outside of the blue portal would be 1m / (t2-t1).
Assuming the cube maintains this speed after exiting the blue portal, it would behave as in scenario B.
A, but it would have the average of the two states.
Portals aren’t real, you know.
More importantly, what if I straddle the blue one?
Img pls?
Stop stealing all my upvotes
Perfectly understood the assignment, 10/10, no notes.
There’d be no cube but yes
In the first moment of exit, it might look like this though
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You can’t place a portal on a moving surface in either game, so neither.
you can in one specific spot in portal 2!
Two, if you count… the big one at the end
it doesn’t look like it’s moving though. and considering how many things in portal 2 move when they look stationary or vice versa…
As far as the game engine is concerned, “stationary” is relative to the… other comparatively big thing: the former big thing is moving very quickly around the latter, even if it looks stationary because it has a lower angular velocity
pretty obvious tbh
So now we just need to build this test in there and we are set
So the cube is just smashed?
It’s a practical answer which is slightly upsetting because I wanted more discourse.
No, cubes cannot be destroyed by crushing. The portal disappears when the surface starts moving and then the cube stops the surface’s descent.
what about the portal on the moon?
Well, everything is moving or not moving, relatively
Someone should write a thesis on it (or whatever it’s called). Could call it something like The Relativity Theory.
It’s unstable and will dissipate on its own when the relative displacement between them will be too great.
Skill issue
You’d make a horrible scientist.
It said ragebait answers only ¯\_(ツ)_/¯
If it is a question of real life physics, then B would be correct
Damnit, you are correct, my bad.
Scientists know when to use existing knowledge.
This was answered decades ago
In that situation both portals (the inside and the outside window frame) have equal, but opposite velocities and therefore cancel out any momentum from the person.
When dealing with OP’s scenario, only one portal is moving.
wikipedia.org/wiki/Steamboat_Bill,_Jr.
Nearly a century ago. Fun fact, this movie inspired Steamboat Willie, the very first appearance of Micky Mouse.
The problem with this analogy is that both sides of the window are at the same point in space so there is no pressure differential. What if the blue portal was at the bottom of the Mariana’s Trench? What force displaces the water to place the cube on the other side?
It wouldn’t. Same as if the other side of the portal was a brick wall. It wouldn’t go through or would be smooshed by whatever force is driving the portal.
I guess the odd thing is, if the orange portal can be moved, the pressure from the brick wall would be directed at the attachment point of the orange portal, otherwise why wouldn’t the orange portal keep moving, since it is not “touching” anything?
If the blue portal was deep under water, the pressure would force the water out the orange portal.
According to a gravitationally accurate simulation a guy did for Youtube, the correct answer is_
… ah, ragebait answers only. Well, mission accomplished, probably >:3
For anyone who doesn’t know, Optozorax on YouTube has made a finite element analysis simulation of gravity ontop of his portal simulation so we can get an answer to the question. The answer is both. Both happen depending on how fast the portal is moving and the where the second portal is placed in the gravity well.
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I’m not sure if it’s the alt text or simply the post’s body, but it reads “Ragebait answers only”
Option B. Portals already break a couple of laws of physics and can reverse entropy, but I like to think you should look at the speed of an object relative to the portal.
Speedy thing go in, speedy thing come out. Clearly explained in game.
But In this case the cube has no speed, the platform does, so it wouldn’t just suddenly start moving.
It has speed relative to the portal though. Everything has some speed because we’re orbiting the sun, etc
The cube does have a non zero speed, it just depends what frame of reference you are measuring it by.
Frame of reference. If a person is hit by a train, from their perspective, they were standing still and the train was moving. But a person in the train can stand up and walk around without difficulty, they can stand on one foot and balance, they can jump up and down and not go flying away; so they are standing still from the trains perspective, it’s everyone and everything outside the train that’s moving.
What happens isn’t a transfer of momentum or energy or velocity; it’s a change in the frame of reference. That can’t happen in real life and breaks a lot of different laws of physics, so people are having trouble wrapping their brain around it.
The portals are a frame of reference. Both the IN and OUT portals have their own, separate frame of reference. The player’s reference doesn’t actually factor into it. When you go through a portal, you are switching from the IN frame of reference, to the OUT frame of reference. And in this situation, the IN frame of reference has you flying toward the portal at whatever speed it’s approaching you.
If anything, it’s rapid exit from the portal would cause an increase in pressure on the top of the cube, causing it to stay in place. The cube still isn’t moving regardless of the velocity relative to the moving platform.
At what point in time would the cube start moving away from the platform it’s sitting on, and what forces act on the cube?
Also shit changes frame of reference all the time irl, and portals a could be thought of as wormholes, which which could theoretically exist IRL.
Alright, since you didn’t like my last explanation for some reason, let me try again.
You know how when you stick your hand out of a moving car, you feel a massive rush of wind, even if it’s not windy out? Ok, so imagine sticking a portal out of a moving car, what do you think happens to the air? Does it come to a dead stop after it exits the portal? Why not? The air itself wasn’t moving, only the car with the portal was.
Solids in this case will work the same way. It doesn’t matter if a solid is moving toward the portal, or the portal is moving toward it, what matters is the relative velocity.
From the orange portals frame of reference, the cube, and everything else in the world, is rushing toward it. So the cube (as well as the entire world around it) has a velocity relative to the orange portal.
But only the cube goes through the portal, the rest of the world does not come with it. At that point, the frame of reference changes. You can think of it like this: The cube has an velocity of X with respect to reference frame Y; once it leaves the portal, it keeps that velocity X but the reference frame changes from Y to Z. The velocity doesn’t disappear.
What if the blue portal is at the bottom of the Marianas Trench?
