PURPOSE: To show the transfer of angular momentum.

DESCRIPTION: Push a ball around the inside of the hoop. Question the class on what direction the ball will take when it reaches the end of the hoop

SUGGESTIONS: We also have a smaller version of this demo setup on a board. It uses a small ball and tygon tubing with targets for the ball to hit. It is very easy to put a camera on and maybe used as a PRS question.

EQUIPMENT: Hoop, ball, video camera.

SETUP TIME: None.

KEYWORDS: transfer of angular momentum