Achilles

Static force beings force fields and active forces being EXERTED forces

I think I heard Richard Feynman say that electrons move around the nucleus in perpetual motion. What does he mean by this? Sorry if I am wrong, if I am, please explain perpetual motion. 

Can you guys personally describe to me what energy is, because I ask on quora and other sites like yahoo and they have different opinions. But I take "energy is the ability to do work" as defining energy... personally

Title says it all pretty much...

Conservation of energy, energy can be neither create or destroyed talks about energy as if it is something. Where as talking about energy in classical mechanics is usually where "the ability to do work" is used. Even e=mc2 has ambiguous use of Energy equating mass with energy that means mass = the ability to do work rather than some tangible quantity that actually exists in some way.