Instructions: Drag the sliders to set the initial angle and speed of the pendulum, and see how the total energy represented by the dashed line changes in turn. Then press start to watch the animation and see the corresponding motion along the potential energy curve. Press reset to stop the animation and pick new initial conditions.

See also:

• Pendulum with angle versus time graph

• Spring with energy graph

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If you encounter any bugs in this animation, please let me know at feedback@PhysicsWithElliot.com.