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Exercise 3A: Reasoning with Ratios and Powers
Equipment:
ping-pong balls and paddles
two-meter sticks
You have probably bounced a ping pong ball straight up and down in the air. The time between hits is
related to the height to which you hit the ball. If you take twice as much time between hits, how many
times higher do you think you will have to hit the ball. Write down your hypoth-
esis:__________________________
Your instructor will first beat out a tempo of 240 beats per minute (four beats per second), which you
should try to match with the ping-pong ball. Measure the height to which the ball rises:_______________
Now try it at 120 beats per minute:________________
Compare your hypothesis and your results with the rest of the class.