| A | B |
|---|
| First Law of Motion | Objects at rest tend to remain at rest and objects in motion tend to remain in motion, traveling at a constant speed and in the same direction. |
| force | A push or a pull. |
| friction | The rubbing of one thing against another. |
| inertia | The tendency of matter to remain at rest if at rest, or if in mtion, to remain in motion in the same direction. |
| newton | A unit used to measure force. |
| Second Law of Motion | The concept that an object's acceleration is related to the strength of the force acting on it and on the objects mass. |
| action force | The initial force exerted in a force-pair. |
| Law of Conservation of Momentum | The principle that states that matter can neither be created nor destroyed by a chemical or physical change. |
| reaction force | The force exerted in response to an action force. |
| Third Law of Motion | The concept that for every action force there is an equal and opposite reaction force. |
