Question

How ball bearings help reduce friction? Write any two examples mining increasing friction comes to our advantage.

Answer 1

Ball bearing is a hollow, circular device containing small metal balls which are seated around the moving parts of a machine. The ball bearing reduces the friction by converting sliding friction into rolling friction. For example, when the axle of a machine fitted with the ball bearing rotates, then the metal balls also roll and hence, the friction is reduced. Ball bearings are used in freewheels of bicycles, the axle of cars, the shafts of motors and many other machines to reduce friction.