Book: # 5

This aluminum frame supports two rigid pendulums, with adjustable weights. One can couple the two pendulums together using a rubber band. When coupled, set one pendulum into motion and observe the energy transfer to the other pendulum va the rubber band. Before long the second pendulum obtain all the energy of the first. Leaving the first pendulum still. The energy will oscillate between the two pendulums until the system damps out do to friction.