Study the effects of gravity with this fun outdoor device. A digital timer in the center of the ball measures the amount of time the ball is in the air. The timer begins when the button on the display is released and stops when the ball is caught or impacts a soft surface. Throw the ball straight up, horizontally, or let it drop to calculate the height, velocity, or magnitude of gravitational acceleration. 3-15/16" (10 mm) dia. Maximum drop of 39-3/8 ft. (12 m). Includes ball rest, and activity guide. Requires two “SR54” batteries (included).
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- 111204