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CH.26 Vocab

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Question
Answer
Velocity   the speed and direction of a moving object  
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Force   a push or a pull  
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Net Force   combination of all forces acting on an object  
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Balanced Forces   Two or more forces whose effects cancel each other out and do not change the motion of an object.  
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Unbalanced Forces   two or more forces acting on an object that don't cancel, and cause the object to accelerate.  
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Newtons First Law of Motion   states that if the net force acting on an object is zero, the object will remain at rest or move in a strait line with a constant speed  
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Friction   force that acts to oppose sliding between two surfaces that are touching.  
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Acceleration   the change in velocity divided by the time over which the change occurred.  
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Weight   a measurement of force that depends on gravity measures in newtons.  
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Newton's second law of motion   states that an object acted upon by a net force will accelerate in the direction of the force will accelerate equal the net force divided by the object's mass.  
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Center of mass   point in a object that moves as if all of the object's mass were concentrated in that point.  
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Newtons third law of motion   states that forces always act in equal but opposite pairs.  
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