Teaching Energy | BenRogers

The more abstract a concept is, the less useful learners find definitions or explanations. There is no lightbulb moment. Rather, our understanding grows by a gradual accumulation of experience, of problems solved.

Energy is a perfect example of this:
“It is important to realize that in physics today, we have no knowledge of what energy “is.”  We do not have a picture that energy comes in little blobs of a definite amount.  It is not that way.  It is an abstract thing in that it does not tell us the mechanism or the reason for the various formulas.“
Richard Feynman, in The Feynman Lectures…

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