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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