ID Code: C5-18
Purpose: Demonstrate Newton's third law of motion
Description: With the sail unmounted, turn on the fan and release the cart; it moves in the direction opposite to that of the blowing air. Mount the sail and blow into it with your breath or with a fan; it moves in the direction which you are blowing. Finally, with the sail in place turn on the fan while holding the cart. Notice the flexing of the sail.