https://www.youtube.com/watch?v=jCD_4mqu4Os&list=PLTjLwQcqQzNKzSAxJxKpmOtAriFS5wWy4
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Physics Equations Book: https://www.amazon.com/dp/B0C47N3TGF
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00:00 Why all this?
00:52 Action Functional
01:53 Nature is extemal
02:44 Calculate the action
03:52 Structure of the Euler-Lagrange equation
05:20 Lagrange function
05:54 How to use Euler-Lagrange equation
