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| Term | Definition |
|---|---|
| mass | a body of matter without definite shape |
| weight | the vertical force exerted by a mass as a result of gravity |
| gravity | the attractive force exerted by a body or object on all other bodies or objects |
| force | a push or pull |
| air resistance | frictional force air exerts on a moving object; acts opposite in direction to the object's motion |
| pound (lb) | most common unit for measuring weight in English measurement system |
| nouton | most common unit for measuring weight in the metric system |