Moving parts of most machines use to reduce friction.

ball bearings

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Solution

The correct option is A ball bearings
Bearings or ball bearings are used to reduce friction between moving parts of a machine. Instead of the two surfaces sliding against each other, they roll over the bearings. As a result of this, sliding friction is replaced with rolling friction.

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In order to reduce friction in machines, ball bearing are used in between the moving parts.

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