Question

Define coefficient of rolling friction ?

Answer 1

When a body rolls in contact with another body, a small area of the bodies in contact get deformed, this causes a frictional force (F) on the body. The magnitude of the frictional force is directly proportional to the normal reaction (R) experienced by the body and the constant of proportionality of the body is called the coefficient of rolling friction. It is denoted by µ_r.

Thus,

F = µ_rR

µ_r = coefficient of rolling friction.