Friction is a necessary evil.

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Friction is a necessary evil :

In most of the cases friction is found to be of disadvantage. Due to friction the energy given to a machine is not totally converted into useful work but a part of it is converted into heat. Friction causes wear and tear of the moving parts of the machines and therefore is an evil.

In many cases friction plays a very important role in our daily life. We are able to walk due to friction otherwise we will slip. We can not stop our cycle if there is no friction between the brakes and the rims. Thus friction is a necessity.

Therefore, sometimes friction is an evil and at some stages it is very necessary in daily life. Thus, friction is necessary as well as an evil.

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