this post was submitted on 18 Aug 2023
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[โ€“] TCBloo@lemmy.world 2 points 1 year ago (1 children)

Violates conservation of momentum unless the portal/train slow down.

[โ€“] whileloop@lemmy.world 2 points 1 year ago

Yes, but portals violate basic physics anyway.

A portal that faces downwards into another portal is effectively a perpetual motion machine. Drop a ferromagnetic object into the loop and wrap some wires around the loop, now you have an infinite electric generator.