| I suggest you read Feynman Lectures Vol 1. There is a chapter in there with a very intriguing introduction to energy and the conservation of it.
From a broader more godly sort of view point, I'd say energy is the Potential to make a Change. The more energy you have the more doors are open to you to do stuff:
Knock an electron out of its potential well
Stop a train
Blow up the earth
Blow up the universe
Slow the explansion of the universe
Reverse the expansion of the universe
If I think of a better generalisation of energy Ill let you know. Very deep subject.
The more painless an exercise, the more likely you are of doing it. The more painful an exercise, the more likely you are of learning from it. |