Image »Rolling Friction on an Inclined Plane« download
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Rolling friction force \( \boldsymbol{F}_{\text r} \) acting between a rolling sphere and the surface of the inclined plane. The rolling friction force is proportional to the normal force, where the proportionality constant is the rolling friction coefficient \( \class{red}{\mu_{\text r}} \).
Rolling friction force is usually smaller than static friction force \( \boldsymbol{F}_{\text s} \).
