Pendulum Wave

The row forms changing wave patterns. Ask students to predict what will happen. Release all pendulums together. Key idea: Different lengths have different periods, so their phases drift apart and realign. Ask: Why do the pendulums stop moving together? Safety and cleanup: Secure frame; keep fingers clear. https://www.google.com/search?q=%22Pendulum%20Wave%22%20science%20demonstration%20experiment