Conservation of energy (part 1) | AP Physics | Khan Academy

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Mechanical energy is the sum of a system’s kinetic and potential energies. If the work done on a selected system is zero and there are no nonconservative interactions within the system, the total mechanical energy of the system is constant. If the work done on a selected system is nonzero, energy is transferred between the system and the environment.

Sections:
00:00 - Predict the mechanical energy change
02:04 - Earth-block system
05:52 - Earth-block-spring system
11:14 - Earth-block-spring air system
14:46 - Revisit the original question

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https://www.youtube.com/watch?v=GdDrYgXzBew
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