| Term | Definition |
| Friction | The force that act to resits the motion of an object |
| Static Friction | The force that acts to resists the motion of an object at rest |
| Kinetic Friction | The force that act to resists the motion of an object in motion |
| Relative | In relation to something else. depends on point of veiw or reference |
| Speed | How fast something is moving |
| Instantaneous Speed | Speed at any instant of time |
| Average Speed | Total distance divided by time interval |
| Velocity | Speed together with direction of motion |
| Acceleration | The rate at which velocity is changing, the change may be in magnitude, direction or both |
| Free Fall | Motion under the influence of the gravitational force only |
| Elapsed time | The time that has passed since the beginning of the event |