Coefficient of Restitution of a Takraw Ball

Abstract

Takraw is a popular sport in Southeast Asia that is akin to “Foot Volleyball”. It is played by two teams kicking a woven rattan or polymer ball over a net. The coefficient of restitution of a polymer takraw ball impacting the floor at a velocity of 5 ms -1was measured for ball temperatures ranging between 1 and 59oC. The coefficient of restitution was determined for impact velocities between 4.7 ms -1and 19.3 ms -1using a 240fps camera. It was shown that reductions in the COR of the ball with increasing temperature and impact velocity can be represented to a good approximation by linear regression lines over the range of temperatures and energies likely to be encountered in actual play.