An object changes its position with respect to a reference point with elapse of time, the object is said to be in motion. Rest:- When an object does not change its position with respect to a reference point with elapse of time, the object is said to be in rest. Example – When a vehicle changes its position with respect to an electric pole (a reference point) with elapse of time, then vehicle is called in motion. And if the same vehicle does not change its position with respect to that electric pole, the vehicle is called in the state of rest. Thus to observe the motion of any object; two things are necessary – a reference point and time. In the above example; vehicle is the object and electric pole is the reference point. A building, tree, or any other static thing can be taken as reference point to observe the motion of an object. Motion along a straight line: When an object moves along a straight line, the motion of the object is called rectilinear motion. ...
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