Question

what do we apply on machine part to avoid friction

Answer 1

Answer:

We should apply lubricants to avoid frictions in machine.

We tried to remove friction in order to increase efficiency.

When oil, grease aur graphite is applied between the moving part of a machine, its thin layer is formed there and moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent.

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Answer 2

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When friction is undesirable we have to reduce the friction. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant.