Question

how do we often perceive an object to be in motion

Answer 1

if it changes its position relative to other object ( usually called the frame of reference ) . It is a relative term
Motion is perceived with respect to a reference frame
An objectcan be in rest with respect to one frame of reference and in motion with respect to other .
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Answer 2

ANSWER:

when object changes its position with the passage of time,so,the object is said to be in motion when its position changes continuously with respect to its surrounding.

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