Author： Cross Rod
Publisher： IOP Publishing
E-ISSN： 1361-6404|36|6|65029-65043
ISSN： 0143-0807
Source： European Journal of Physics, Vol.36, Iss.6, 2015-11, pp. : 65029-65043
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Abstract
Rolling friction is commonly associated with deformation of the rolling object or surface, particularly if the object or surface is soft. When a hard object rolls on a hard surface, surface roughness is also a significant factor. Several experiments are described where the effects of surface roughness on rolling resistance were investigated using very rough rolling objects (gear wheels), and smooth balls on very rough surfaces. In all cases it was found that the coefficient of rolling friction increased with rolling speed and surface roughness, and decreased as the ball diameter increased.
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