- Acceleration: The rate at which velocity changes
- Meter: The basic unit of length
- Motion: The state in which one object's distance from another is changing
- Reference Point: A place or object used for comparison to determine if an object is in motion
- Speed: The distance an object travels per unit of time; S = D/T
- Velocity: The distance an object travels per unit of time in a given direction; V = D/T