Why friction a necessary evil ?
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it causes obstruction to working of things.also it promotes the early wearing and tearing of machines along with their overheating .therefore the machines need to be taken care of .though these things show it in bad light ,it is very important to note that without friction life would become difficult and we would not be efficient.
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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
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