Question

Justify the statement 'friction is a necessary evil'. write any two methods to reduce friction.

Please give me correct answer​

Answer 1

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Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. Hence it is considered as a necessary evil .

1. Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
2. Lubrication is another way to make a surface smoother. ...
3. Make the object more streamlined. ...
4. Reduce the forces acting on the surfaces. ...
5. Reduce the contact between the surfaces.

Answer 2

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Required answer-:

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. ... But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil .

Oiling or lubricating is the method to reduce friction.

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