2D Spring Pendulum

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This Demonstration simulates a spring pendulum moving in a vertical plane with damping. You can adjust the initial conditions and spring parameters, then start the simulation. The damping force is proportional to the velocity of the moving mass. Forces acting on the moving body can be shown in real time.
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Contributed by: Árpád Kósa (March 2011)
Open content licensed under CC BY-NC-SA
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"2D Spring Pendulum"
http://demonstrations.wolfram.com/2DSpringPendulum/
Wolfram Demonstrations Project
Published: March 7 2011