- #1
RestlessMind
- 173
- 0
I have a feeling that this might sound like a question I should already know the answer to, but here goes.
If a man holds a heavy weight up, he's expending energy to work against gravity and keep it there. However, he is not doing work if he doesn't move the weight.
A magnet can stick to the side of a fridge, but it does no work because nothing moves. However, doesn't it have to expend some energy to defy gravity like it does?
Am I wrong? If so, how does it work? If not, where does the energy come from? I assume that I am wrong, because I can't think of any place the energy could come from.
Thanks!
If a man holds a heavy weight up, he's expending energy to work against gravity and keep it there. However, he is not doing work if he doesn't move the weight.
A magnet can stick to the side of a fridge, but it does no work because nothing moves. However, doesn't it have to expend some energy to defy gravity like it does?
Am I wrong? If so, how does it work? If not, where does the energy come from? I assume that I am wrong, because I can't think of any place the energy could come from.
Thanks!