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Work and Simple Machines

Practice Test
      
  1.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   5,000 J  
  b.   50,000 J  
  c.   50 J  
  d.   500 J  
  Hint    
      
  2.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   input force divided by output force  
  c.   output force times input force  
  d.   output force divided by input force  
  Hint    
      
  3.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   pulley system  
  c.   pulley group  
  d.   wheel and axle  
  Hint    
      
  4.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   inclined plane  
  c.   pulley  
  d.   wedge  
  Hint    
      
  5.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 decreases.  
  c.   It stays the same.  
  d.   It increases.  
  Hint    
      
  6.On what point does a lever pivot?  
  a.   the middle  
  b.   the end  
  c.   the fulcrum  
  d.   the arm  
  Hint    
      
  7.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   wheel and axle  
  c.   lever  
  d.   pulley  
  Hint    
      
  8.Which simple machines are found on a hammer?  
  a.   plane and lever  
  b.   screw and pulley  
  c.   lever only  
  d.   wedge and plane  
  Hint    
      
  9.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    
      
  10.How do input force and output force relate to each other?  
  a.   They are always different.  
  b.   They are unrelated.  
  c.   They are the same.  
  d.   The input is always less than the output.  
  Hint    
      
  11.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    
      
  12.Using an inclined plane allows you to apply __________.  
  a.   no force  
  b.   the same force  
  c.   a lesser force  
  d.   a greater force  
  Hint    
      
  13.What is the scientific formula for work?  
  a.   W = F x d  
  b.   W = F/d  
  c.   W = F + d  
  d.   W = F - d  
  Hint    
      
  14.What is transferred when work is done?  
  a.   matter  
  b.   mass  
  c.   velocity  
  d.   energy  
  Hint    
      
  15.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   inclined plane  
  c.   wedge  
  d.   pulley  
  Hint    
      
  16.Name the four simple machines.  
  a.   inclined plane, lever, wheel and axle, and pulley  
  b.   plane, lever, screw, and wedge  
  c.   wedge, lever, pulley, and wheel  
  d.   screw, lever, wedge, and plane  
  Hint    
      
  17.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   impossible to calculate  
  c.   less than 100 percent  
  d.   more than 100 percent  
  Hint    
      
  18.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.   lifting the blocks  
  b.   when lifting the blocks and when moving them across the desert  
  c.   moving the blocks across the desert  
  d.   No work was done in a scientific sense.  
  Hint    
      
  19.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    
      
  20.Power is measured by which units?  
  a.   newtons  
  b.   watts  
  c.   newton-meters  
  d.   joules  
  Hint    

 
   
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