| Term | Definition |
|---|
| acceleration | the rate at which velocity changes; an object does this if its velocity changes, if its direction changes, or both. |
| velocity | the speed of an object in a particular direction |
| motion | an objects change in position overtime when compared with a reference point |
| speed | the rate at which an object moves, this depends on the distance traveled and the time taken to travel that distance |
| mass | the amount of matter that something is made of |
| gravity | a force of attraction between objects that is due to their masses |
| friction | a force that opposes motion between two surfaces that are touching |
| net force | the force that results from combining all the forces exerted on an object |
| newton | the SI unit of force |
| force | a push or pull. all have both size and direction |
| weight | a measure of the gravitational force exerted on an object, usually by earth, |
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