This question already has an answer here:
If I put a brick onto an steel platform, that platform can hold the brick A LONG TIME, if not FOREVER. Does the platform exert force? If so, then shouldn't it have infinite energy to resist the pull of gravity? If not, shouldn't it hold at least an ENORMOUS amount of energy to support the brick? And if the platform does NOT exert energy, then what is holding the brick back from plummeting to the earth?
Thanks guys! :)
EDIT: Come to think of it, the platform is held together by the electromagnetic force. But I still wonder whether or not gravity and the other fundamental forces have infinite energy or not.