• Rolling Friction

    The force of friction that comes into play when a body rolls over the surface of another body called rolling friction (fr ). When a wheel rolls over a road, rolling friction comes into play and resist the motion of a rolling wheel. This type of friction is typically a combination of several friction forces at the point of contact between the wheel and the ground or other surfaces. It is the weakest type of friction (compared to static and sliding friction). This is the reason that wheels and ball bearings facilitate motion.