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week 4 motion

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Term
Definition
friction   A force that opposes the motion of a body across a surface or through a gas or liquid.  
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gravity   A force that exists between any two objects that have mass.  
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speed   Distance traveled per unit of time.  
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velocity   The speed and direction of moving objects.  
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acceleration   A change in the velocity (speed, direction, or both) of a body.  
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deceleration   slowing down  
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Scale   description of the relative size or amount of 2 or more things; a device used for measuring weight  
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Resist   to push or act against  
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Kilogram   metric unit for describing mass  
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Attract   to pull towards  
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