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Combining two different internet debates
(sopuli.xyz)
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this post was submitted on 18 Aug 2023
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If we assume local relativity, their momentum, which would then be relative to the orange portal (the one which they will interact with), wouldn't be "nil". It is pretty clear to me that both portals have different relativities, and therefore, would clearly lead to case B.
Then I could imagine a sport where you have a racquet with a portal on it, and you swipe at a suspended ball, with a target somewhere beyond the other portal.
Think of a portal like a doorway or just a frame of one. Stepping through it seamlessly puts you on the other side. If you were standing still, and the door went around you, would any force be exerted upon you, causing you to move? That's why I think it would be A. Nothing is applying any force to you, you're just basically teleporting. You may not even actually fully emerge from the portal, being trapped on the threshold, since no force is moving you beyond the point where the two ends meet.
No, a doorway means the two portals don't move relatively to each other. Which is clearly not the case here.