| Question | Answer |
|---|---|
| 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 |
| unbalanced force | 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 |
