Question

Friction is a necessary evil.Explain

Answer 1

friction produces heat and it reduced by using ball bearings and smoothen surfaces, without friction we can't stand write ride on bike it is a necessary evil.

Answer 2

friction is a necessary evil as if friction wouldnt be there we wont be able to walk as the irregularities of the surfaces wont get locked

and it is an evil because it tears our shoes and many other things...