Question

Which option justifies that friction is a necessary evil?

writing on a paper.

kicking a football.

hitting a cricket ball.

swinging a pendulum.

​

Answer 1

Writing on a paper.

It is because of friction between the graphite of the pencil and the paper which causes the graphite to write on the paper.

Answer 2

Writing on a paper justifies the fact that friction is a necessary evil.

Explanation:

• Friction force causes plenty of losses in normal maintenance and wear and tear of machinery.

• But most of the important tasks can't be performed without friction.

• Basic activities like walking and writing on a surface are possible because of friction. It's therefore considered a necessary evil.

• Friction is considered a necessary evil because it has both harmful and beneficial effects.                    

• For example, Writing with a pencil is possible because paper provides friction to the tip of a pencil.