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motion & forces
unit 1, lessons 1-4
| Term | Definition |
|---|---|
| position | describes the location of an object |
| speed | a measurement of how quickly the object changed position |
| reference point | a location to which you compare other locations |
| vector | a quantity that has both size and direction |
| motion | a change in position over time |
| velocity | speed in a specific direction |
| acceleration | the rate at which velocity changes |
| centripetal acceleration | acceleration in circular motion |
| force | a simple push or pull |
| inertia | the tendency of all objects to resist a change in motion |
| net force | combination of all the forces acting on an object |
| gravity | a force of attraction between objects due to their mass |
| free fall | when gravity is pulling down and no other forces are action on it |
| orbit | when an object travels around another object in space |