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| Term | Definition |
|---|---|
| friction | a force that oppose motion between two surfaces that are in contact. |
| net force | the combination of all of the forces acting on an object. |
| balanced force | stated when the net forces acting on an object equal zero. |
| unballanced forced | stated when the net force acting on an object is not zero. |
| inertia | the tendency of an object to resist being moved or if the object is moving to resist a change in speed or direction until an outside force acts on the object. |
| gravity | a force of attraction between objects that is due to their masses. |