Question

We use ball bearings between the hub and axle of ceiling for and bicycles. Why?
please don't copy the answer from google​

Answer 1

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• Ball bearings are used in axle of ceiling fans in all the blades are carefullly attached to the centre circle. So there is a friction between them. Huge heat will be produced and it will be dangerous to switch it on. Hence ball bearings reduce friction and help in usage of ceiling fan.

Answer 2

Explanation:

Since the rolling friction is smaller than the sliding friction and sliding is replaced in most machines by rolling with the use of ball bearings. A common examples are the use of ball bearing between the hub and the axle of a ceiling fan and the bicycle