Comment on Which is it Lemmy?
Ibex@lemmy.world 1 month ago
The object going into the portal has no momentum so it would be A.
Comment on Which is it Lemmy?
Ibex@lemmy.world 1 month ago
The object going into the portal has no momentum so it would be A.
flying_sheep@lemmy.ml 1 month ago
No momentum in relation to what? Momentum doesn’t exist in isolation.
philipp_@discuss.tchncs.de 1 month ago
Momentum relatively to the source game engine grid.
Nalivai@lemmy.world 1 month ago
To the space outside of the blue portal. Moving the orange portal doesn’t drag the whole surroundings, so assuming both places are on the same planet, the momentum of the box in relations to both places is the same
Snazz@lemmy.world 1 month ago
Moving the orange portal kinda does ‘drag the whole surroundings’. It moves an entire universe.
The cube is stationary relative to the universe of the platform it’s on, but it has momentum relative to the universe through the portal. The question is which universe is the cube in? What is the boundary of the portal surface?
flying_sheep@lemmy.ml 1 month ago
As Optozorax taught us, gravity must act through the portal.
Nalivai@lemmy.world 1 month ago
Well, it doesn’t in the only source of knowledge we have: the game Portal. I don’t know enough about gravitational forces to have a coherent theory on it, gravitational waves moving through space-time is a bit beyound my real understanding. But in the game if you put a portal on a ceiling, it doesn’t “suck” you until you’re throuth it, so there it isolates gravity somehow.