<P> In practice, the theoretical tension acting on the belt or rope calculated by the belt friction equation can be compared to the maximum tension the belt can support . This helps a designer of such a rig to know how many times the belt or rope must be wrapped around the pulley to prevent it from slipping . Mountain climbers and sailing crews demonstrate a standard knowledge of belt friction when accomplishing basic tasks . </P> <P> The equation used to model belt friction is, assuming the belt has no mass and its material is a fixed composition: </P> <Dl> <Dd> T 2 = T 1 e μ s β (\ displaystyle T_ (2) = T_ (1) e ^ (\ mu _ (s) \ beta) \,) </Dd> </Dl> <Dd> T 2 = T 1 e μ s β (\ displaystyle T_ (2) = T_ (1) e ^ (\ mu _ (s) \ beta) \,) </Dd>

Coefficient of friction between v belt and pulley