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| an object that is in motion or at rest will stay that way unless acted on by a force |
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| the faster or heavier an object, the harder it is to stop |
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| the force that pulls objects toward each other |
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| two objects rub against each other in the opposite direction; stopping force; for example, sand on an icy road |
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| speed in a particular direction |
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| how fast an object is moving; total distance/total time |
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| change in speed or direction |
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Depends on: 1) size of objects 2) distance between objects |
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| change in position of an object; movement |
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x-axis is time y-axis is distance |
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| forces acting on object are equal - no movement |
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| forces acting on object are unequal - one object moves |
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