Friction is useful in our day to day lives as

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It would not be possible to light a matchstick by rubbing it against the matchbox if there was no friction.

You would not be able to write on paper without friction between the pen and paper.

Friction causes nails and screws to hold on to walls.

All of these

answer is D.

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Detailed Solution

The correct option is 4.
As friction is force which works between two surfaces, the following points hold true.
●       The friction between the head of the matchstick and the rough surface on the matchbox helps to light a matchstick.
●       The friction between the pen and the paper helps us to write on the paper.
●       Friction between the nails and the screws helps them to hold on to the walls.
Thus, friction helps us in all the above given day-to-day life activities.

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