Question

how do ball bearing and wheels help in reducing friction
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Answer 1

Ball bearing reduce friction by using smooth balls lubricated with oil or grease that freely roll between a smooth inner and outer surface. The area of contact between inner and outer surface decreases hence friction decreases between them.

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Answer 2

Explanation:

Ball bearing reduce friction by using smooth balls lubricated with oil or grease that freely roll between a smooth inner and outer surface. The area of contact between inner and outer surface decreases hence friction decreases between them.