Q.

Which of the following is an example of frictional force?


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a

A moving ball stops

b

Sliding slide

c

Car moving on the road

d

All of above 

answer is D.

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Detailed Solution

The correct option is 4.
Contact force is the force that is applied by objects in contact with each other. The frictional force is an example of contact force. So, the two bodies must be in contact for the frictional force to act. When two bodies in contact try to move against each other, then frictional force acts. Also, when a moving ball stops or when we are sliding down a slide and when a car is moving on the road, the two bodies are in contact with each other and hence the friction force acts between them.
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