Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. Fr is the resistive force of rolling friction. μr is the coefficient of rolling friction for the two surfaces (Greek letter "mu" sub r) N is the normal force pushing the wheel to the surface.
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the friction exists between the surfaces when our body rolls over another
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what is called rolling