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| an objects change in position relative to a reference point |
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| the total distance traveled divided by the total time taken |
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| the speed of an object in a paticular direction |
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| the rate at which velocity changes over time; an object accelerates if its speed, direction, or both changes |
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| a push or a pull exerted on an object in order to change the motion of the object; force has size and direction |
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| the combination of all of the forces acting on an object |
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| a force that opposes motion between two surfaces that are in contact |
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| moving objects that occur when to objects that are moving with friction involved |
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| friction that does not move when a force is applied |
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| substances put on objects to reduce the amount of friction that oject will have against it |
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