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| an objects change in position over time when compared to the reference point |
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| An object that appears to story in place in relation to an object in motion |
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| the rate in which an object moves: speed depends on the distance traveled and the time taken to travel |
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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, if its direction changes, or if both its speed and its direction changes |
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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; kiinetic energy depends on speed and mass |
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