Luigi Fortunati
2023-04-19 06:49:41 UTC
In my animation
https://www.geogebra.org/m/ggqgaeeb
there is an elevator that works with electromagnetic force and not with
gravity.
How does it differ from Einstein's elevator when it is restrained and
when it descends in free fall?
[[Mod. note -- *IF* the ratio electromagnetic_force / mass is the
same for the elevator and the test mass ("robot"), then this is indeed
exactly analogous to an Einstein elevator. If this ratio differs, then
the weight force won't be zero when the constraint is removed (i.e.,
when the elevator is free-falling).
For gravity, Einstein's (weak) principle of equivalence says that the
corresponding ratio gravitational_force / mass is indeed the same for
*all* objects, so Einstein's elevator automatically gives zero weight
when its constraint is removed (i.e., when the elevator is free-falling).
-- jt]]
https://www.geogebra.org/m/ggqgaeeb
there is an elevator that works with electromagnetic force and not with
gravity.
How does it differ from Einstein's elevator when it is restrained and
when it descends in free fall?
[[Mod. note -- *IF* the ratio electromagnetic_force / mass is the
same for the elevator and the test mass ("robot"), then this is indeed
exactly analogous to an Einstein elevator. If this ratio differs, then
the weight force won't be zero when the constraint is removed (i.e.,
when the elevator is free-falling).
For gravity, Einstein's (weak) principle of equivalence says that the
corresponding ratio gravitational_force / mass is indeed the same for
*all* objects, so Einstein's elevator automatically gives zero weight
when its constraint is removed (i.e., when the elevator is free-falling).
-- jt]]