Final answer:
Motion is a relative concept in physics. The perception and measurement of motion depend on the frame of reference chosen by an observer.
Step-by-step explanation:
Motion is a relative concept in physics. This means that the description and measurement of motion depend on the frame of reference chosen by an observer. For example, if a person is standing inside a moving train, the observer sees the objects inside the train as motionless, while an observer on the ground sees the same objects moving along with the train. Thus, the perception of motion depends on the reference point chosen.
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