Magnetic chaos pendulum. Animated simulation of magnets and a pendulum being used to demonstrate chaotic movement. This simulation has four magnets, and one pendulum. The motion of the pendulum, consisting of a metal ball on a thread, is influenced by the magnets, the force of gravity, and a certain amount of air friction. The resulting movement looks irregular. While the movement is deterministic, the path traced by the pendulum will depend on the starting conditions. This is known as deterministic chaos.