Question

How do ball bearing reduce friction between machine parts?​

Answer 1

Answer:

Ball bearings use balls to separate two “races,” or bearing rings, to reduce surface contact and friction across moving planes. The rotation of the balls causes a reduced coefficient of friction when compared with flat surfaces rubbing against each other.

Answer 2

Since ball bearing work with the use of rolling friction, which is has the least friction we can say that, ball bearings reduce friction between machine parts.