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11 Cards in this Set

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the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
SPEED
a push or a pull; all forces have both size and direction
FORCE
an object's change in postion relative to a reference point over a period of time
MOTION
the force that results from combining all the forces exerted on an object
NET FORCE
a force that opposes motion between two surfaces that are touching
FRICTION
the amount of matter that something is made of; its value does not change with the object's location in the universe
MASS
the rate at which velocity changes; an object accelerates if its speed, direction, or both change
ACCELERATION
the speed of an object in a particular direction
VELOCITY
a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
WEIGHT
the SI unit of force
NEWTON
a force of all raction between objects that is due to their mass
GRAVITY