Conservation of energy | Physics | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:energy/x6679aa2c65c01e53:conservation-of-energy/v/conservation_of_energyEnergy is a conserved quantity. If a system is isolated, the total energy of the system remains constant as energy converts from one form to another. If a system is not isolated, the total energy of the system can change. However, the amount by which the system's energy changes is exactly equal to the amount of energy that transferred to or from the surroundings.
Sections:
00:00 - Intro
00:16 - What is a system?
01:35 - Applying conservation of energy
04:26 - Energy conservation with friction
08:00 - Energy conservation in orbits
09:50 - Energy conservation in approaching nuclei
13:50 - Energy conservation in electron transitions
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