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# unit 2

### lessons 1,2,3

position the location of an object
reference point a location to which another location is compared
motion an object's change in position relative to a reference point
speed the distance traveled divided by the time interval during which the motion occured
vector a quantity that has both size and direction
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes over time; an object accelerates if its speed, direction,or both change
centripetal acceleratrion the acceleration directed toward the center of a circular path
force a push or a pull exerted on an object in order to change the motion of an object
net force the combination of all of the forces acting on an object
intertia the tendency of an object to resist a change in motion unless on outside force actson the object
gravity the force of attraction between objects that is due to their masses
free fall the motion of a body when only the force of gravity is acting on the body
orbit the path that a body follows as it travels around another body in space
Created by: 18beckerj1008
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