Ragebait answers only
this post was submitted on 26 Jul 2026
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Incorrect. The answer is A, and here is why.
GLaDOS specifically states "Momentum, a function of mass and velocity, is conserved between portals." If scenario B was correct (which it is not) then if the portal was put on an object lighter than the box and then quickly moved over the box, the box would be launched at a speed equal to the speed of the lighter object, while it has more mass, this is not a conservation of momentum.
The best way to explain movement through portals is that momentum is only conserved from a perspective that encompasses all of the objects involved, this is true for regular physics as well actually. Consider this, what if the portal was shoved very quickly over the box down to it's halfway point? The obvious answer is that the box would only appear halfway out of the other portal, but if you subscribe to the "logic" that leads to answer B, then the box is actually sucked up by the portal, while the actual logical and intuitive answer is that only half the box sticks out of the portal, and it stays where it was placed.
Portals aren't objects, they don't have mass, or even a velocity, they are a shortcut in space, and that was what GLaDOS was explaining when she said that momentum was conserved. Although B seems to initially make sense, it is not correct from a game lore perspective, nor from an actual physical perspective.
If momentum is conserved then neither A or B is correct, the box should be an infinity thin sheet. If the portal is half way through the box if it maintains it's thickness the box has to be moving at the speed of the portal out of it.
Except it's not moving out of the portal, the portal is moving over the box. I get it when people say that it doesn't matter if the portal is moving, or of the box is moving, and they are right, up to a point. As soon as you need to account for the movement on the other side of the portal, you have to include that space in your frame of reference, and relative to that space, the velocity of the box is 0.
As I explained here...
I must applaud your diligent rage baiting, well done