why do we say that friction is a necessary evil
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friction is a force of opposition on a stationary or moving body.it has various advantages as well as disadvantages. the very pen that we hold in our hand is due to friction. if there is no friction we won't even be able to walk. we won't be able to wrote on a blackboard. on the other side friction causes repair in mechanical parts. this is because it cause wear in tear in machine parts. also it slows down the speed of a car or any other moving object. hence, friction is called as a necessary evil.
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friction is a necessary evil because wear and tear of shoes are due to friction. Forest fires are result of friction. But friction is useful also. It helps us to sit ,walk,write
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