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Chapter 5
| Term | Definition |
|---|---|
| Motion | An objects change in position over time when compared with a reference point |
| Speed | The rate at which an object moves; this depends on the distance travelled and the time taken to travel the distance |
| Velocity | The speed of an object in a particular direction |
| Acceleration | The rate at which velocity changes because speed changes, direction changes, or both speed and direction change |
| Gravity | A force of attraction between objects that is due to their masses |
| Weight | A measure of the gravitational force exerted on an object |
| Mass | The amount of matter something is made of |
| Force | A push or pull; all forces have both size and direction |
| Newton | The SI unit of force |
| Net Force | The force that results from combining all the forces exerted on an object |
| Friction | A force that opposes option between two surfaces that are touching |