Displacement
the difference between the initial (first) position and the final position of an object
Motion
the process of changing position
Position
An object's distance in a certain direction from a reference point
Reference point
The starting point you choose to describe the location, or position, of an object
Average speed
The total distance traveled divided by the total time taken to travel that distance
Constant speed
the rate of change of position in which the same distance is traveled each second
Instantaneous speed
The speed at a specific instant in time
Speed
The measure of the distance an object travels per unit of time
Velocity
The speed and the direction of a moving object