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| an object's change in position over time when compared with a reference point |
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| an object that appears to stay in place in relation to an object being observed for motion |
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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 |
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| the speed of an object in a particular direction |
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| the rate at which velocity changes; an object accelerates if its speed changes, if its direction changes, or if both its speed and direction change |
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| acceleration in which velocity decreases |
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| a push or pull; all forces have both size and direction |
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| the force that results from combining all the forces exerted on an object |
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| a force that opposes motion between two forces that are touching |
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| the energy of position or shape |
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| the energy of motion; kinetic energy depends on speed and mass |
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| The Law of Conservation of Energy |
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| the law states that energy is neither created nor destroyed |
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| a force of attraction between objects that is due to their masses |
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| a measure of gravitational force that is exerted on an object, usually by the earth |
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| the amount of matter that something is made of |
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