Simple Pendulum

How this simulation works

Use the Length slider to set the pendulum's rod length (in metres), the Initial Angle slider to raise the bob to its starting position (in degrees from vertical), and the Damping slider to control how much air resistance slows the swing. Press Start to release the bob, Pause to freeze it mid-swing, and Reset to return it to the initial angle. With zero damping the pendulum swings forever; with damping turned up, its amplitude decays over time until it comes to rest at the bottom.