Dynamic Coefficient of Friction

A measure of the friction of a sliding or moving ball on a rubber surface. Rubber can have very high friction at low impact speeds but at high impact speeds the friction drops.

When the dynamic coefficient is low, the rubber can impart little or no spin. A low friction rubber also has trouble generating speed at closed racket angles.

The frictional performance of rubber is related to a number of factors such as:

• the type of sponge and its thickness
• the type of material of the top sheet
• the type of glue (and its state of cure) used to put the rubber on the blade
• the pattern on the top sheet
• the pip geometry of the top sheet