Potential energy and conservative forces (part 3) | AP Physics | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now. https://www.khanacademy.org/science/ap-physics-c-mechanicsThe force exerted by an ideal spring is a conservative and obeys Hooke’s law. Applying the general equation for change in potential energy reveals that the elastic potential energy of a system containing an ideal spring is given by the following equation, where Δx is the distance the spring has been stretched or compressed from its equilibrium length: ΔU_s = ½k(Δx)^2. The elastic potential energy is zero when the spring is at its relaxed length.
Sections:
00:00 - Intro
01:00 - Modeling the spring force (Hooke's law)
03:11 - Work done by the spring force
05:49 - Why is the spring force a conservative force?
06:47 - Equation for elastic potential energy
10:26 - Understanding the spring-block-wall system
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