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]]