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Forces & Motion
Physical Science
| Term | Definition |
|---|---|
| mass | the amount of space an object takes up; this is sometimes related to an object's weight (though they are different) |
| force | a push or a pull |
| speed | a measure of an object's distance traveled in a given amount of time |
| gravity | a force that causes objects with mass to be attracted to one another |
| friction | a force that resists motion of one surface against another |
| motion | a change in an object's position in relation to other objects |