PIRA: 1D55.10
Equipment List
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Plexiglas hoop with arch inside
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metal sphere (1/2") or marble
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ruler
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overhead projector
Instructions
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Place the hoop on the overhead with the cut side up. Spin the ball inside the hoop-note its path.
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Turn the hoop over with the cut side down. Again spin the ball inside the hoop and note its path after it leaves the hoop