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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


The size of a carriage is very small as compared to the distance between two stations. Therefore, the carriage can be treated as a point-sized object.
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In which of the following examples of motion, can the body be considered approximately a point object:
(b) a monkey sitting on top of a man cycling smoothly on a circular track


The size of a monkey is very small as compared to the size of a circular track. Therefore, the monkey can be considered as a point-sized object on the track.
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A woman starts from her home at 9.00 am, walks with a speed of 5 km h–1 on a straight road up to her office 2.5 km away, stays at the office up to 5.00 pm, and returns home by an auto with a speed of 25 km h–1. Choose suitable scales and plot the x-t graph of her motion.


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In which of the following examples of motion, can the body be considered approximately a point object:

c) a spinning cricket ball that turns sharply on hitting the ground.


The size of a spinning cricket ball is comparable to the distance through which it turns sharply on hitting the ground. Therefore, the cricket ball cannot be considered as a point object.
230 Views

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In which of the following examples of motion, can the body be considered approximately a point object:

(d) a tumbling beaker that has slipped off the edge of a table.


The size of a beaker is comparable to the height of the table from which it slipped. Hence, the beaker cannot be considered as a point object.
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