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# Unit 4 Motion part 2

### Vocab assigned for quiz on Tuesday 12/8

TermDefinition
Gravity Force that pulls an object toward the center of a much larger object. On Earth, it is measured as 9.8 m/s/s
Net force Sum total of all forces (both positive and negative) acting on an object.
Inertia Property of matter which resists a change in motion.
Friction Force that opposes motion.
Air Resistance Upward force that acts to slow down a falling object.
Newton's 1st Law Law of Inertia. States that an objects motion will remain constant unless acted on by an unbalanced force.
Newton's 2nd Law Law of acceleration. States that acceleration depends on an object's mass and the force applied to it.
Newton's 3rd Law Law of action & reaction. States that for every action force there is an equal and opposite reaction force.
Law of Conservation of Momentum States that the total momentum prior to a collision is equal to the total momentum after a collision. Momentum cannot be created or destroyed.
Position vs. Time Graph Graph showing the location of an object relative to the origin. The slope of this graph = the velocity of the object.
Velocity vs. Time Graph Graph showing the speed and direction of an object's motion. The slope of this graph = the acceleration of the object.
Created by: a.weis