Match the vocabulary words with their definitions. 1 . newton a change of velocity; measure of how quickly velocity is changing 2 . velocity the property of matter that resists change in velocity 3 . magnitude speed in a given direction 4 . acceleration the unit of force in the metric system 5 . inverse size 6 . inertia a push or a pull 7 . force the force that objects exert on each other because of their mass 8 . proportion relation in size of one thing to another 9 . gravity moves, acts, or behaves in an opposite relationship