Question

In which of the following cases, friction is desirable?

• A. Walking on road
• B. Riding bicycle
• C. pulling suitcase
• D. writing on paper with pen

Answer 1

Answer: (A), (B), (D)

The correct options are
A Walking on road
B Riding bicycle
D writing on paper with pen

We can walk, ride bicycle and write on paper with pen because of friction. If roads are frictionless then we cannot walk and ride bicycle. Also if the paper is frictionless then we cannot write on it. These are the advantageous effect of friction. But because of friction we have to apply more force while pulling suitcase. So pulling suitcase on frictionless surface is easiest. It is a disadvantageous effect of friction.