Question

What are ball bearings? how are they useful

Answer 1

A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.

The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. ... However, they can tolerate some misalignment of the inner and outer races.

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Answer 2

here's your answer........
the principal that rolling friction is less than sliding friction is also made use of in ball bearings which contain steels balls or rollers. Ball bearings used between the wheel and axle of a car reduce friction considerably. most machines with moving parts use ball bearings.

I hope it will help you.......