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Chapter 1 vocab for Science Forces

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Question
Answer
Motion   when an object's distance from another object is changing.  
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Reference Point   A place or object used for comparison to determine if something is in motion.  
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International System of Units (SI)   a system of measurments based on multiples of ten and on established measures of mass, length, and time.  
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Meter   the basic SI unit length  
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Speed   The distance an object travels per unit of time  
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Velocity   the speed and direction of an object in motion.  
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plates   one of the major pieces that make up earth's upper layer.  
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Acceleration   the rate in which velocity changes.  
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