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| Pressure caused by the force exerted by Earth's atmosphere |
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| force that opposes the movement of an object in air |
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| forces that are equal in size but opposite in direction |
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| instrument used to measure air pressure |
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| as the speed of a fluid increases, its pressure decreases |
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| force that opposes the motion of an object |
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| force of attraction between all objects in the universe |
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| materials that reduce friction |
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| speed at which air resistance and gravity acting on a falling object are equal |
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| forces that cause a change in the motion of an object |
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