PURPOSE: To demonstrate the direction of acceleration for both linear and circular cases.

DESCRIPTION: When the accelerometer is accelerated linearly, the ping-pong ball, being less dense than the water, moves toward the direction of the acceleration. When the jars are rotated the ping-pong ball moves toward the center of rotation.

SUGGESTIONS:

REFERENCES: (PIRA 1G20.87)

EQUIPMENT: Water-filled plastic tubes with ping-pong balls, as photographed.

SETUP TIME: None.