MrNerd
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russ_watters said:No!
...
Hmmmm... I was sure it was. Is it necessary for general forces, like pushing or pulling physically? I suppose it could be possible in some higher up thing, maybe even one or two of the fundamental forces. I'm thinking electromagnetism would be a good bet, since it repels by existing. But I don't really understand why the charges repel/attract, either. Could you explain which forces don't need energy to operate, please? I haven't reached higher up classes in my college yet, so I wouldn't have done it in class.