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### 11 Cards in this Set

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 Motion an object’s change in position over time when compared with a reference point Speed the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance Velocity the speed of an object in a particular direction Acceleration the rate at which velocity changes; an abject accelerates if its speed changes, or its direction changes, or if both its speed and its direction changes Force a push or a pull; all forces have both size and direction Newton (N) the SI unit of force Net Force the force that results from combining all the forces exerted on an object Friction a force that opposes motion between two surfaces that are touching Gravity a force of attraction between objects that is due to their masses Weight a measure of the gravitational force exerted on an object, usually by the Earth Mass the amount of matter that something is made of; its value does not change with the objects location in the universe