| Term | Definition |
|---|
| force | A push or pull |
| motion | to change position |
| average speed | The distance traveled over a certain period of time |
| acceleration | a change in speed or direction |
| velocity | the speed of an object in a particular direction |
| gravity | a force of attraction between two objects depending on the mass of those objects. |
| friction | a force that resists motion by way of contact between two things |
| sliding friction | a force that resists motion as two things slide across each other |
| rolling friction | resistance of motion caused by a round object rolling across another object |
| fluid friction | a force that resists motion of an object due to a liquid or gas |
| Newton | Unit used to measure a force (N). |
| Newton's Second Law | An object will accelerate, depending on the object's mass, and the forces exserted on the object. |
| Newton's Third Law | For every action force, there is an equal but opposite reaction force |
| Newton's First Law | In object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an unbalanced force. |
| unbalanced force | When two forces acting on each other cause an object to move. |
| balanced force | When forces acting on each other equally and in opposite directions which cause no movement of an object |
| momentum | A measure of the motion of an object due to its mass and velocity. |
| inertia | The tendancy of an object to resist movement or a change in movement. |
| static friction | Two objects not in motion due to their contact |
| fluid | a liquid or a gas. |
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