If two cars are going side by side with same speed then with respect to each other they are in a state of rest, but with respect to persons on the road they are in a state of motion. Thus, it is clear that description of motion depends on the observer or what is called in the language of Physics as a ‘Frame of Reference’.
A convenient way to fix a frame of reference is to choose an origin and three mutually perpendicular axes labeled as x, y and z axes. Then the position of an object in space is, specified by the three coordinates. As the object moves, one or two or all the three coordinates change with time and it is the essential task of mechanics to obtain these coordinates as functions of time. If we know x(t), y(t) and z(t), then the motion of the object is completely described.
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