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Happy and Unhappy Ball Collisions M-n3g
A happy ball rolls down the incline and knocks the block over; the unhappy ball does not. HRW 6th:   10.4 Reese Chapter:   9.5 RHK 5th:   6.5 PIRA DCS classification:   1N30.52

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University