EXPERIMENTAL COEFFICIENT OF FRICTION FOR THE IMPACT OF A TENNIS BALL

摘要

Experimental results show that the coefficient of restitution is constant for different impact angles and different low velocities. The coefficient of friction is increasing when the impact angle increases; however, it is constant for different velocities for the same impact angle within our initial velocity range. Normal impact experiments have been used in order to obtain the contact force coefficients. The coefficients are used for the simulation of the oblique impacts. The theory has been compared with the experiments for β= 15°, 30°, 45°, 57°. Both the displacement and final velocity are analyzed. The simulation results are in a good agreement with the experimental results.