Question

Methods of reducing friction

Answer 1

Answer:

Polishing

lubrication

ball - bearings

Explanation:

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Answer 2

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Polishing : When We polish a surface,it's roughness decreases. The surface becomes smooth and friction gets reduced. We also sometimes rub the surfaces with a fine sand paper to reduce their unevenness.

Lubrication : Bicycle and motor mechanics use grease between rhe moving parts of these machines. In all these cases,we want to reduce friction in order to increase efficiency. Oil-Like substances which help to reduce friction are called Lubricants