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a force of attraction between objects that is due to their masses

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friction is a force that opposes motion between two surfaces that are in contact

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the rate at which velocity changes over time. such as speed, direction, or both change

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how fast an object goes

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an object that changes its position relative to a reference point

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the combination of all the forces acting on a object

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the SI unit for force

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a simple push or a pull

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the speed of an object in a particular direction