| Newtons First Law | An object in motion (or at rest) will tend to stay in motion (or at rest) until it is acted upon by an outside force. |
| Inertia | The tendency of an object to resist changes in its velocity. |
| Friction | A force that opposes motion, resulting from the contact of two surfaces. |
| Equation 10.1, Total Force | total force=(mass)x(acceleration) |
| Newton | The Newton is the standard unit of force and is defined as a: kg x m /sec² |
| Kinetic friction | Friction that opposes motion once the motion has already started. |
| Static friction | Friction that opposes the initiation of motion. |
| Newtons Second Law | When an object is acted on by one or more outside forces, the total force is equal to the mass of the object times the resulting acceleration. |
| Newtons Third Law | For every action, there is an equal and opposite reaction. |
