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2013 Chapter 3 8th grade Science

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Mechanics   show
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show Scalar quantities tell size OR magnitude of the thing measured  
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What does a vector quantity tell us?   show
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show Distance is scalar; displacement is vector  
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show Velocity is vector; speed is scalar  
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show Acceleration, force, and momentum  
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show How far an object has moved  
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show Distance and direction of an object from its starting point  
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show The distance an object moves per unit of time  
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Velocity   show
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Average speed   show
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show Speed at any given moment in time like on your speedometer in the car  
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Constant speed   show
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show Speed that is increasing or getting faster  
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show Negative acceleration or speed that is decreasing/slowing down  
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Define Force   show
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State Newton’s First Law of Motion   show
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State Newton’s Second Law of Motion   show
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show All objects fall at the same rate if there is little or no air resistance  
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What is the acceleration of gravity at the earth’s surface?   show
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show Mass is the amount of matter in something and weight is the pull of gravity. Mass is measure on a balance in g or kg and weight is measured on a spring scale in N. Mass cannot change or be zero and weight can.  
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What is momentum?   show
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How do we calculate it?   show
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Be able to calculate using the formula for Force   show
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Be able to calculate using the formula for momentum   show
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Advanced only: What is Impulse?   show
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Advanced only: Relate Impulse to momentum   show
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show When momentum changes quickly, Force can be minimized by extending the time it acts. Air bags, seat belts, and bumpers which crumple all work to allow extra time between the Force and its impact in a collision.  
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Created by: judi829
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