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Motion and Forces
Unit 4 lesson 1-4
| Term | Definition |
|---|---|
| position | Describes the location of an object |
| reference point | A location to which you compare other locations |
| motion | A change in position over time |
| speed | A measure of how far something moves in a given amount of time |
| vector | A quantity that has both size and direction |
| velocity | Speed in a specific direction |
| acceleration | The rate at which velocity changes |
| centripetal acceleration | Acceleration in circular motion |
| force | Push or pull |
| net force | The combination of all the forces acting on an object |
| inertia | The tendency of all objects to resist a change in motion |
| gravity | A force of attraction between objects due to their mass |
| free fall | When gravity is pulling it down and no other forces are acting on it |
| orbit | When an object travels around another object in space |