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because you have to spend the same amount or more energy getting an object back up the hill as you got from it rolling down the hill.
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But that's not actually true. If you pick up a box and hold it for one hour then you've spent alot more energy than if you merly lift it up and drop it at once. Yet, the box doesn't have any more energy when it falls after one hour than it does if you release it instantly. So where did the energy you continously applied to the box for one hour go?
PhoenixD: Alright, I can go with the spacetime theory as passable, but that still doesn't account for the fact that gravity does 'consume' the kinetic energy of masses, which means we still have a change in the amount of energy in the universe. Or am I missing something? Where's the kinetic energy going?
It does all sound a little odd, since if energy = mass, and mass is what creates gravity, and gravity drains energy, then we're left with mass that is actually consuming itself.
Oh, and while we're on the mystic and unexplained, does anyone know why *REPLICA WATCHES* are so popular? My inbox has been continously spammed with that stuff for over a year.