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this post was submitted on 26 Jul 2026
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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?