Question

We use ball bearings to _______________ the friction.

Answer 1

1. Whenever two objects slide against each other, friction prevents them from moving smoothly.
2. But, when we roll the object against another surface, the rolling friction proves to be far weaker than the sliding friction because of the point of contact between the two surfaces.
3. Ball bearings reduce friction by using smooth balls lubricated with oil or grease that freely roll between a smooth inner and outer surface.

Hence, we use ball bearings to reduce the friction.