Abstract
Experimental results are presented on the coefficient of rolling friction, μ R, measured for a variety of different balls using a stringless pendulum. A wide range of results was obtained, depending on ball stiffness, surface roughness, ball radius and ball speed. Soft balls dissipate energy as a result of hysteresis losses in the contact region and have relative high values of μ R. Hard balls rolling on a hard surface dissipate energy by multiple collisions between asperities, with low values of μ R that increase with rolling speed and surface roughness. The experiment is very easy to set up and would be a useful addition in a student laboratory or as a lecture demonstration.
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