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?
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No. In order to use the energy that potential energy from gravity can provide, that object must first be “raised up” by other forces, which requires energy. Since transfer of energy is not 100% efficient, some of the energy will be lost to heat etc, preventing the creation of a perpetual motion machine.
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