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Work and Simple Machines

Practice Test
      
  1.A ramp in a building is an example of which machine?  
  a.   inclined plane  
  b.   wedge  
  c.   pulley  
  d.   lever  
  Hint    
      
  2.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   1000  
  c.   4  
  d.   50  
  Hint    
      
  3.What does a screw consist of?  
  a.   an inclined plane wrapped around a cylinder  
  b.   a wedge wrapped around a pipe  
  c.   a wheel and axle in a vertical position  
  d.   a lever wrapped around a pole  
  Hint    
      
  4.The unit for work is a joule, which is equal to __________.  
  a.   N - m  
  b.   N/m  
  c.   N x m  
  d.   N + m  
  Hint    
      
  5.What is the scientific formula for work?  
  a.   W = F - d  
  b.   W = F + d  
  c.   W = F/d  
  d.   W = F x d  
  Hint    
      
  6.How do input force and output force relate to each other?  
  a.   They are unrelated.  
  b.   The input is always less than the output.  
  c.   They are the same.  
  d.   They are always different.  
  Hint    
      
  7.Which is an example of work being done in a scientific sense?  
  a.   doing homework  
  b.   carrying a box  
  c.   lifting a box  
  d.   pushing against a stationary box  
  Hint    
      
  8.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   machine system  
  c.   pulley system  
  d.   wheel and axle  
  Hint    
      
  9.What is transferred when work is done?  
  a.   energy  
  b.   velocity  
  c.   matter  
  d.   mass  
  Hint    
      
  10.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   output force divided by input force  
  c.   output force times input force  
  d.   input force divided by output force  
  Hint    
      
  11.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 stays the same.  
  c.   It increases.  
  d.   It decreases.  
  Hint    
      
  12.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.   moving the blocks across the desert  
  b.   when lifting the blocks and when moving them across the desert  
  c.   lifting the blocks  
  d.   No work was done in a scientific sense.  
  Hint    
      
  13.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It increases.  
  b.   It stops.  
  c.   It stays the same.  
  d.   It decreases.  
  Hint    
      
  14.Which simple machines are found on a hammer?  
  a.   plane and lever  
  b.   screw and pulley  
  c.   wedge and plane  
  d.   lever only  
  Hint    
      
  15.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   wheel and axle  
  c.   lever  
  d.   pulley  
  Hint    
      
  16.A chisel is an example of which machine?  
  a.   lever  
  b.   wedge  
  c.   pulley  
  d.   wheel and axle  
  Hint    
      
  17.The efficiency of all machines is __________.  
  a.   more than 100 percent  
  b.   exactly 100 percent  
  c.   less than 100 percent  
  d.   impossible to calculate  
  Hint    
      
  18.Power is measured by which units?  
  a.   watts  
  b.   joules  
  c.   newton-meters  
  d.   newtons  
  Hint    
      
  19.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   50,000 J  
  c.   5,000 J  
  d.   50 J  
  Hint    
      
  20.Name the four simple machines.  
  a.   wedge, lever, pulley, and wheel  
  b.   plane, lever, screw, and wedge  
  c.   screw, lever, wedge, and plane  
  d.   inclined plane, lever, wheel and axle, and pulley  
  Hint    

 
   
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