bouncing ball

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This problem was contributed to the Feynman Lectures Website by Sukumar Chandra.

A small solid rubber ball of radius r is thrown against a rough horizontal floor such that its velocity just before striking the floor at A is v making an angle of 60 with the horizontal and also has a back spin of angular velocity ω. It is observed that the ball bounces from A to B, then from B to A, then from A to B, etc. Assuming perfectly elastic impact determine

    a) the required magnitude of ω of the back spin in terms of v and r.

    b) the minimum magnitude of co-efficient of static friction,μs min, to enable this motion.


Solutions (listed by author)

Sukumar Chandra (pdf, 76K)


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