Question

How does the use of ball bearings reduce friction?

Answer 1

In ball bearings, hard steel balls are fixed between the two cylinders. The axle of the vehicle is fitted tightly into the inner cylinder, the wheel is put in tight contact with the outer cylinder. Ball bearings reduce friction by using smooth balls lubricated with oil or grease that freely roll between a smooth inner and outer surface. The main concept of the ball bearing is that objects that roll past each other produce less friction than if the objects were sliding against each other.