What does energy really mean in the real world?

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Frankww
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What does energy really mean in the real world? Or it is just a mathematical tool?
 
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energy is simply means the capacity to do work. energy is what gives you power to do things. Everything, i mean just everything, consists of energy.

That's the view of a college student. I'm no kind of expert in this...
 
Energy is a mathematical tool.But it's quite useful.
 

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