We classify things on different basis and among all of them there is basis of speed which have further two simple categories. When the position of object is constant i.e. rest and the other is when there is movement of object from one position to another position with respect to the observer i.e.
Rest: A stationary building, a tree, a static bench and so on are some of the things that are usually found still so it’s clear that any object which is not moving and changing its position in respect of time, distance and observer are said to be at rest.
Motion: A moving car, a flying bird, a moving vehicle, a running fan and so on are categorized as being in motion. It can also be defined as a peculiar set of reactions in which object changes its position with respect to its surrounding, distance and time.
Rest and motion are relative states. It means an object which is at rest at one frame of reference can be in motion in another frame of reference at the same time and vice-versa. For example if a person is inside any moving vehicle, he/she will find that vehicle at rest as per their frame of reference but if a person is somewhere outside any moving vehicle, he/she will find that particular vehicle in motion as per their frame of reference. Point of Reference can be anything, be it a tree or even a person.
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