Position and Displacement

The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary...

To describe an object's motion, its position needs to be specified relative to a convenient frame of reference. An arbitrary set of axes that describes an object's position and motion is known as a frame of reference.

Generally, Earth or stationary objects on Earth are used as frames of reference. For example, an airplane's position durin...