4 ms·
If a pen is dropped on _a_ moon, will it Hey, the pen really could float away, no? The centrifugal force on a rotatating body is mv^2/2. If this is exactly equ
by ced 17y ago
If a pen is dropped on _a_ moon, will it
Hey, the pen really could float away, no? The centrifugal force on a rotatating body is mv^2/2. If this is exactly equal to the gravitational force, the pen would "stay where it is". And if it rotates faster than that, the pen would "float away".
- lolcraft 17y agoThe centrifugal (pseudo-)force is not mv^2/2 (kinetic energy), but mv^2/r (much less). And the centrifugal force must be orders of magnitude less than the gravitational pull: if not, the moon wouldn't be there in solid state, to start with, as all its particles would separate from its center of mass. Not very plausible.