Physics - NLM Question with Solution | TestHub
In which of the following examples of motion, can the body be considered approximately a point object:
Options:(select one or more)
Answer:
Solution:
A body can be treated as a point object when its size and internal/rotational motion are irrelevant to the motion being described.
(A) A railway carriage moving without jerks along a straight track - all its parts have the same motion, so it can be treated as a point. Correct.
(B) A sparrow sitting on a man cycling smoothly on a circular track - the sparrow is tiny compared with the track, so it is effectively a point. Correct.
(C) A spinning cricket ball that turns sharply on hitting the ground - the spin (rotation) is central to the motion, so it cannot be treated as a point. Wrong.
(D) A tumbling beaker - its rotation matters, so it cannot be treated as a point. Wrong.
Correct options: (A), (B).
