The principle of least action is a different way of looking at physics that has applications to everything from Newtonian mechanics, to relativity, quantum mechanics, and beyond.

This video is the first part of a series about the principle of least action, explaining the action for a particle in Newtonian mechanics. The second is about a particle in special relativity, the third about a particle in general relativity, and the fourth about the action for a string in string theory.

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