Two simple pendulums of identical length are connected on a suspended wire. If only one of the pendulums is made to swing, in a short while, the second pendulum begins moving the same way as the first one. This happens because with each swing, the first pendulum gives the second one a small tug. Because they have the same length, these small tugs happen at the natural frequency of the first one, and the motion of the second one builds up quickly. This exhibit gives a simple demonstration of the concept of natural frequency and the transfer of energy from one body to another.

Coupled Pendulum is available in the "I AM a Scientist" travelling exhibit package.