What is the period of a simple pendulum?

For small angles the period is T = 2 pi sqrt(L/g) where L is the length and g is gravitational acceleration. This simulator shows both the small-angle approximation and the full nonlinear behavior for large swings.

Why does the pendulum slow down?

Damping represents air resistance and friction at the pivot. Set damping to zero to see perpetual motion with perfect energy conservation. Increase damping to see the amplitude decay exponentially.

Can I simulate pendulums on other planets?

Yes. Click the Moon preset for g=1.62 or Jupiter for g=24.79 or drag the gravity slider to any value. Watch how the period and swing behavior change with different gravitational fields.

Simple Pendulum Simulator — Interactive Physics Lab

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