Explain the following:

(i) Why do we jerk wet clothes before spreading them on line?

(ii) Why does dust flies off when carpet is hit with stick?

(iii) Why fruits fall off the branches in strong wind?

(iv) Why a pillion rider falls forward, when the driver of a two-wheeler suddenly applies brakes ?

Ans. (i) In the beginning, water and clothes are in the state of rest. When the wet clothes are jerked, the particles of water tend to continue in its state of rest because of inertia of rest. Therefore, the removal of water helps wet clothes to dry quickly because the droplets of water fall off from the clothes.

(ii) When a carpet is hit with a stick, the carpet moves, but dust on account of inertia of rest flies off because of the sudden movement. It is in fact the carpet which comes out of the dust.

(iii) In the beginning, the fruits on the branches are in the state of rest. On account of inertia of rest, the fruits tend to continue in their state of rest, but due to strong wind the fruits fall off the branches.

(iv) At first the pillion rider and driver are in a state of motion. When the driver applies brakes, the body of pillion rider continues moving forward on account of inertia of motion. Hence, the pillion rider falls forward.

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