‘Rest and motion are relative concepts.’ Explain the statement wi… - Vidyadip

Question

‘Rest and motion are relative concepts.’ Explain the statement with an example.

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Answer

A body can be described to be at rest or in motion with respect to a system of co¬ordinate axes known as the frame of reference.
A body is in motion if it changes its position with respect to a fixed reference point in a frame of reference. On the other hand, a body is at rest if it does not change its position with respect to a fixed reference point in a frame of reference.
An object can be said to be at rest with respect to a frame of reference while the same object can be said to be in motion with respect to a different frame of reference.
Example: In a running train, all the travellers in the train are in a state of rest if the train is taken as the frame of reference. On the other hand, all the travellers in the train are in a state of motion if ground (or platform) is taken as the frame of reference.
Thus, motion and rest always need a frame of reference to be described. Hence, rest and motion are relative concepts.

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