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physical science voc
vocabulary
| Term | Definition |
|---|---|
| simple machines | make work easier |
| mass | the amount of matter in an object |
| force | a push or pull |
| friction | a force that causes objects in motion to speed up or slow down when two surfaces rub together |
| speed | a measure of how far an object moves in a certain amount of time |
| motion | movement, or change in an objects position |
| position | the place where an object is located |
| gravity | a force that pulls things down |