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| The change in velocity during a particular time period. |
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| the friction from air molecules hitting an object as the object moves through the air. |
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| Equal forces acting in opposite directions. |
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| The object an observer uses to detect motion. |
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| A force between surfaces that resists the movement of one surface past the other surface. |
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| The force of attraction that exists between any two objects. |
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| The resistance of an object to change in its state of motion. |
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| The speed at any given point. |
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| A statement that describes events or relationships that exist in nature. |
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| The amount of matter in an object. |
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| The combination of all the forces acting on an object. |
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| In the metric system, the unit used to measure force or weight. |
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| The change in position of one object compared to the position of another. |
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| The change in position of one object compares to the position of another. |
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Definition
| The distance an object moves in a certain period of time. |
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| A device that shows instantaneous speed. |
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| A measure of both the speed and direction of a moving object. |
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| A measure of the pull of gravity on an object's mass. |
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