Question

Which of the following does not reduce friction?
(a) polishing
(b) lubrication
(c) ball bearing
(d) treading​

Answer 1

Answer:

c) ball bearing

Explanation:

c) ball bearing

Answer 2

Answer:

Trading does not reduce friction.

polishing, ball bearing and lubrication

Explanation:

Friction is due to roughness of friction. If we make the surface smooth by smooth then friction will be reduced.

Use of ball bearing reducing the friction in machines rotating parts.

Lubricants are used in machines and moving parts to reduce friction.

So, your answer is trading.

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