Abstract
It is difficult to examine the interior of a solid ball to determine what happens when it bounces. A soft rubber disk was used as a substitute, impacting on edge, to film the two-dimensional deformation of the disk versus time. The disk bounced in a similar manner to a rubber ball. Results are presented for oblique as well as vertical impacts. The results provide an explanation of the puzzling feature that an obliquely incident ball can ‘overspin’ without losing its grip on the bounce surface. That is, the rebound angular velocity, ω, can be larger than vx/R despite the fact that ω must be equal to vx/R in order for a ball or a disk to maintain its grip. The explanation is that the upper and lower parts of a ball or disk rotate at different angular velocities during an oblique impact.
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