PURPOSE: To demonstrate inertial forces in bodies submerged in air and in water.
DESCRIPTION: On one side of the arm a pingpong ball is suspended by a string from the top of a jar filled with air. On the opposite side of the arm a pingpong ball is attached by a string to the bottom of a jar filled with water. When the arm is rotated, the ball in the air jar moves outward and the ball in the water jar moves inward.
SUGGESTIONS:
REFERENCES: (PIRA 1D52.30) See Demonstration Reference File for several interesting articles.
EQUIPMENT: As photographed.
SETUP TIME: None.
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