Explain the following:

(i) Why do the doors of a corridor train open or shut, when the train starts or stops?

(ii) Why is it necessary to run along with the moving bus and in the same direction of bus, while alighting from it?

(iii) Why does a player run for some distance before taking a long jump?

(iv) Why does a person fall off the back of a stationary horse, if the horse starts off suddenly?

(v) Why a neat hole is formed in the glass pane, if a bullet is fired on it from a close range?

Ans. (i) The doors of a train tend to continue in their state of rest because of inertia of rest when train starts or stops suddenly. Thus, the doors are shut backward with respect to the motion of train.

(ii) While alighting from the bus, the feet of the person will suddenly come to rest, while the rest of the body is in motion and hence he will fall down and may get injured. Therefore, it is necessary to run along with the moving bus in the same direction while jumping out of it.

(iii) A player runs for some distance before taking a long jump because in doing so he picks up inertia of motion which helps in covering a longer distance.

(iv) A person falls off the back of a stationary horse if the horse starts off suddenly because on account of inertia of rest he continues in its state of rest.

(v) When the bullet is fired on the glass pane a neat hole is formed because the rest of the glass pane on account of inertia of rest tends to continue in its state of rest.

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