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Motion quiz

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
what explains the difference between speed and velocity?   one has direction, the other does not.  
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what best determines the net force when more than one force is acting on an object?   a combination of all forces acting on an object.  
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when the net forces equal 0 N, they are...?   balanced.  
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what always causes change in speed, direction, or both?   unbalanced forces  
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what causes an object to start moving?   unbalanced forces  
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what is the net force on an object when you combine a force of 10 N north with a force of 5 N south?   5 N north  
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dividing the total distance traveled by the total time is how to calculate:   average speed  
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what would you call a building if you compared it to a moving student?   a reference point.  
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