Friction is a necessary evil. Explain the statement giving examples.

Friction is considered a necessary evil because it is both beneficial and destructive. 

Friction assists us in walking, writing, holding objects, and lifting them. As a result, it is essential to our survival. 

Many critical processes are impossible to complete without friction. On the other hand, it is sometimes superfluous. 

It can lead to a loss of energy and wear and tear of equipment parts, as well as harm to objects. 

As a result, it is a necessary evil.

Final Answer :  Friction is a necessary evil because it has both harmful and beneficial effects.