Is gravity endless energy?

Question

You need energy to produce a force that compensates gravity. So if you apply that force for a huge amount of time, will gravity ever be depleted?

In: 39

Answer 1

Force is cheap. Energy isn’t. They are not the same thing. Dropping a rock from high up to a lower position in a gravity well converts potential energy into some other kind of energy (maybe one you can use). But a rock exerting pressure on a table, regardless of how much pressure or for how long, is not an energy transfer.