If the bounce surface is perfectly
rigid, the total work done by the force F acting at the bottom
of the ball is zero, since the point of application of the force
remains at rest. Nevertheless, * F dy represents the change
in kinetic energy, which is equal and opposite to the change
in potential energy arising from compression of the ball plus
any energy dissipated during the collision. The total energy,
including the energy dissipated, therefore remains constant.
If the bounce surface is perfectlyrigid, the total work done by the force F acting at the bottomof the ball is zero, since the point of application of the forceremains at rest. Nevertheless, * F dy represents the changein kinetic energy, which is equal and opposite to the changein potential energy arising from compression of the ball plusany energy dissipated during the collision. The total energy,including the energy dissipated, therefore remains constant.
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