Let us do a small activity. Stand up and walk for 5 minutes. After 5 minutes start running and run for 5 more mins. Now relax and sit. What did you just do? You ran and you walked. But how were you able to run or walk? What is that force that helps us in walking and running? We can do our daily activities because of a force,¬†known as ‘Friction’.

But what is a frictional force? Why is it necessary? Let us study more about it.

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