Comment on Which is it Lemmy?
Kolanaki@pawb.social 2 months agoThe difference in this case is that the object has 0 momentum and the portal doesn’t impart its momentum to the cube because you can’t collide with the portal.
Comment on Which is it Lemmy?
Kolanaki@pawb.social 2 months agoThe difference in this case is that the object has 0 momentum and the portal doesn’t impart its momentum to the cube because you can’t collide with the portal.
tomi000@lemmy.world 2 months ago
Of course it has momentum relative to the portal.
Kolanaki@pawb.social 2 months ago
That is not how either relativity or momentum work. The cube is still inert and the portal’s movement would have no effect on it unless it has some acting force that pushes it when passing through. Even if the exit portal was moving, the cube would remain stationary unless it had nothing to rest upon and gravity pulled it down.