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4th grade chapter 10
Motion
| Term | Definition |
|---|---|
| gravity | the force that pulls all objects toward each other |
| motion | a change in the position of an object |
| speed | the rate at which an object changes position |
| velocity | the speed and the direction an object moving |
| force | any push orpull |
| reference point | a place or object used to determine if an object is in motion |