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Motion is a change in position of an object with respect to time and its reference point. Motion is typically described in terms of displacement, direction, velocity, acceleration, and time. Motion is observed by attaching a frame of reference to a body and measuring its change in position relative to that frame.

Distance is the magnitude between two interval points.

Displacement is the change in position of an object.

Reference point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all.

Speed is a scalar quantity that refers to "how fast an object is moving.

Velocity is the rate at which an object changes position over a period of time.

Acceleration is the rate at which the velocity of an object changes over time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law.


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