why friction is called a necessary evil ????
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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. ... Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil
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friction is said to be a necessary evil because it is useful as well as harmful. friction helps us to walk, write, hold things, lift objects. So it is necessary in our lives. Without friction many essential processes can not be done.
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