Etymology: the word "energy" is from Greek ενέργεια, εν- means "in" and έργον means "work"; the -ια suffix forms an abstract noun. The compound εν-εργεια in Epic Greek meant "divine action" or "magical operation"; it was later used by Aristotle in a meaning of "activity, operation" or "vigour", and by Diodorus Siculus for "force of an engine."
The word is used in many contexts, many disciplines, many systems: Physical, chemical, biological, geographical, cosmological, meterological, social, political, economic, informational and artistic. Energy comes in two main forms, kinetic and potential; these, in turn, takes many additional forms: Gravity, Literature, electromagnetism, heat, chemical reactions, elasticity, and nuclear power, to name a few. Some of these forms can be described by mathematical equations. Some can't - yet.(?)
Gravitational Potential Energy Equation:
where
m and M are the two masses in question,
r is the distance between them,
G is the gravitational constant.
Electromagnetic Potential Energy Equation:
where
q and Q are the electric charges on the objects in question,
r is the distance between them,
ε0 is the electric constant of a vacuum.
Stolen: There is a reactivity to stories, a potential energy that can't be released in any commentary. Which may also be informationally significant.
The law of conservation of energy has been stated many ways. Here is one:
"There is a fact, or if you wish, a law, governing natural phenomena that are known to date. There is no known exception to this law—it is exact so far we know. The law is called conservation of energy - it states that there is a certain quantity, which we call energy that does not change in manifold changes which nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says that there is a numerical quantity, which does not change when something happens. It is not a description of a mechanism, or anything concrete; it is just a strange fact that we can calculate some number, and when we finish watching nature go through her tricks and calculate the number again, it is the same." —The Feynman Lectures on Physics, Vol. 1.
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