Question

Why is friction a nessesary evil?

Answer 1

if there is no friction we cannot live
if there is no friction the vehicles cannot move
we cannot live without friction

Answer 2

Answer:

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