Analysis reveals how backspin and object orientation affect bouncing behavior, indicating key friction impact.
A spherical ball incident obliquely on a horizontal surface usually bounces forwards but can bounce backwards if it is incident with backspin. Elongated objects can bounce backwards even if incident without spin, provided that the object is pointing backwards when it lands on the surface. Explanations are given in terms of the friction forces involved.
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Rod Cross (2025) studied this question.
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