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In which of the following examples of motion, can the body be considered approximately a point object.
(a) A railway carriage moving without jerks between two stations.
(b) A monkey sitting on top of a man cycling smoothly on a circular track.
(c) A spinning cricket ball that turns sharply on hitting the ground.
(d) A tumbling beaker that has slipped off the edge of table.
Asked by Abhay Last Modified
Answer 
(a) The railway carriage moving without jerks between two stations, so the distance
between two stations is considered to be large as compared to the size of the train. Therefore the train is considered as a point object.
(b) The monkey may be considered as point object because value of distance covered on
a circular track is much greater.
(c) As turning of ball is not smooth, thus the distance covered by ball is not large in the reasonable time. Therefore ball cannot be considered as point object.
(d) Again a tumbling beaker slipped off the edge of a table cannot be considered as a point object because distance covered is not much larger.
The mivinm objects in option (A) and (B) i.e. the railway carriage and the monkey could be considered as point objects while solving a problem as their size is much smaller as compared to the distances they are traveling to/in. Whereas in later two options, the size of the mivinm objects are significant as compared to the distances they are traveling in. So, the ball and the beaker can't be considered as point objects in the given particular situations.
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