Q.State the laws of rolling friction.
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Start your 14-day free trial to unlock the full solution →Rolling friction follows its own set of experimental laws, distinct from sliding friction, and is always much smaller in magnitude for the same surfaces and load.
When a body (like a wheel or ball) rolls over a surface instead of sliding, the resistance it experiences is called rolling friction, and it obeys the following laws:
1. Rolling friction is much smaller than sliding (kinetic) friction between the same pair of surfaces under the same normal load — this is why wheels, ball bearings, and rollers are used to reduce friction in machines.
2. The force of rolling friction is directly proportional to the normal reaction (N) between the rolling body and the surface:
where is the coefficient of rolling friction.
3. Rolling friction is inversely proportional to the radius of the rolling body — a larger wheel/roller experiences less rolling friction than a smaller one under the same load.
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