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Work and Simple Machines

Practice Test
      
  1.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N + m  
  c.   N/m  
  d.   N - m  
  Hint    
      
  2.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   50 J  
  c.   50,000 J  
  d.   5,000 J  
  Hint    
      
  3.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   in the opposite direction that you walk  
  b.   downward  
  c.   along the hallway  
  d.   upward  
  Hint    
      
  4.Power is measured by which units?  
  a.   watts  
  b.   newton-meters  
  c.   newtons  
  d.   joules  
  Hint    
      
  5.On what point does a lever pivot?  
  a.   the middle  
  b.   the fulcrum  
  c.   the arm  
  d.   the end  
  Hint    
      
  6.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stops.  
  b.   It stays the same.  
  c.   It increases.  
  d.   It decreases.  
  Hint    
      
  7.Name the four simple machines.  
  a.   plane, lever, screw, and wedge  
  b.   screw, lever, wedge, and plane  
  c.   inclined plane, lever, wheel and axle, and pulley  
  d.   wedge, lever, pulley, and wheel  
  Hint    
      
  8.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It goes to zero.  
  b.   It increases.  
  c.   It decreases.  
  d.   It stays the same.  
  Hint    
      
  9.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   a wheel and axle in a vertical position  
  c.   an inclined plane wrapped around a cylinder  
  d.   a lever wrapped around a pole  
  Hint    
      
  10.Which simple machines are found on a hammer?  
  a.   plane and lever  
  b.   wedge and plane  
  c.   screw and pulley  
  d.   lever only  
  Hint    
      
  11.When the pyramids were built, blocks were lifted from a quarry and moved across the desert. When was work done in a scientific sense?  
  a.   when lifting the blocks and when moving them across the desert  
  b.   moving the blocks across the desert  
  c.   lifting the blocks  
  d.   No work was done in a scientific sense.  
  Hint    
      
  12.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   50  
  c.   4  
  d.   1000  
  Hint    
      
  13.What is transferred when work is done?  
  a.   matter  
  b.   velocity  
  c.   energy  
  d.   mass  
  Hint    
      
  14.Which is an example of work being done in a scientific sense?  
  a.   carrying a box  
  b.   pushing against a stationary box  
  c.   lifting a box  
  d.   doing homework  
  Hint    
      
  15.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   pulley  
  c.   lever  
  d.   wheel and axle  
  Hint    
      
  16.The efficiency of all machines is __________.  
  a.   more than 100 percent  
  b.   less than 100 percent  
  c.   exactly 100 percent  
  d.   impossible to calculate  
  Hint    
      
  17.What is a sign that work is being done?  
  a.   mass  
  b.   matter  
  c.   density  
  d.   motion  
  Hint    
      
  18.How do input force and output force relate to each other?  
  a.   They are the same.  
  b.   They are unrelated.  
  c.   They are always different.  
  d.   The input is always less than the output.  
  Hint    
      
  19.Mechanical advantage is equal to __________.  
  a.   input force divided by output force  
  b.   output force times input force  
  c.   input force times output force  
  d.   output force divided by input force  
  Hint    
      
  20.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   pulley  
  c.   inclined plane  
  d.   wedge  
  Hint    

 
   
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