Question

justify the statement 'friction is necessary evil' write any two methods to reduce friction? ​

Answer 1

Explanation:

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Answer 2

Answer:

Friction plays a very important role in our day-to-day life. Many of our daily life activities depend upon the existence of frictional force. In some cases, friction is a necessity. In other cases, friction causes a wastage of energy and damage in moving parts of machinery and causes wear and tear, etc. It is therefore, regarded as a necessary evil.

Some ways to reduce friction are:-

•By polishing the surface.

•By lubricating the surface by oils, grease, talcum powder, etc.

•By using materials like ball bearings that decreases the wear and tear in machinery parts.