Position of a moving object is given by its position vector. Position vector is determined by two parameters; magnitude of the vector and the angel θ which the vector makes with x-axis. Angle θ, in fact, shows the direction of the vector.

Position vector is drawn from a reference point ‘O’, usually the place of the observer, to the place in coordinate axes, where the object exists at a certain time. If the object is moving in a straight line then only the magnitude of the vector is changing, the angle θ remains constant. If the object is moving in a circle, only the angle θ is changing and the magnitude of the position vector remains constant. If the body is moving on a zig-zag path, both magnitude and direction of the position vector change.

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