Section 4.3 Interaction Forces

Practice Test
      
  1.Newton's third law of motion states that __________.  
  a.   objects remain either at rest or continue moving in a straight line with constant speed only if the net force on that object is zero  
  b.   a force is needed to keep an object moving  
  c.   the acceleration of an object is proportional to the net force exerted on the object  
  d.   all forces come in pairs  
  Hint    
      
  2.In Figure 4-16c, if the box has a mass of 6.0 kg, what will the normal force of the table on the box be?  
  a.   8.8 N  
  b.   9.8 N  
  c.   110 N  
  d.   50 N  
  Hint    
      
  3.In Figure 4-16b, if the box has a mass of 6.0 kg, what will the normal force of the table on the box be?  
  a.   8.8 N  
  b.   9.8 N  
  c.   50 N  
  d.   160 N  
  Hint    
      
  4.A 75-kg person pushes a 12-kg person in a swing with a force of 3 N. What is the acceleration of the person doing the pushing?  
  a.   25 m/s2  
  b.   0.4 m/s2  
  c.   0.25 m/s2  
  d.   0.04 m/s2  
  Hint    

 
   
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