Question

Friction is a necessary evil. Comment.

Answer 1

Friction is said to be a necessary evil because it is useful as well as harmful. Friction helps us to walk, write, hold things, lift objects. So it is necessary for our lives. Without friction, many essential processes can not be done. On the other hand, it is also unnecessary at times. It sometimes results in loss of energy, wear and tear of parts of machinery, due to which it also damages things. So it is an essential evil.