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Work and Simple Machines

Practice Test
      
  1.Which is an example of work being done in a scientific sense?  
  a.   pushing against a stationary box  
  b.   doing homework  
  c.   lifting a box  
  d.   carrying a box  
  Hint    
      
  2.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.   No work was done in a scientific sense.  
  d.   lifting the blocks  
  Hint    
      
  3.What is a sign that work is being done?  
  a.   motion  
  b.   density  
  c.   mass  
  d.   matter  
  Hint    
      
  4.A drill bit is an example of which type of machine?  
  a.   lever  
  b.   pulley  
  c.   wheel and axle  
  d.   screw  
  Hint    
      
  5.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   pulley  
  c.   inclined plane  
  d.   lever  
  Hint    
      
  6.What is transferred when work is done?  
  a.   matter  
  b.   velocity  
  c.   energy  
  d.   mass  
  Hint    
      
  7.A chisel is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   pulley  
  d.   wheel and axle  
  Hint    
      
  8.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.   upward  
  c.   downward  
  d.   along the hallway  
  Hint    
      
  9.Power is measured by which units?  
  a.   newtons  
  b.   joules  
  c.   newton-meters  
  d.   watts  
  Hint    
      
  10.How do input force and output force relate to each other?  
  a.   The input is always less than the output.  
  b.   They are always different.  
  c.   They are the same.  
  d.   They are unrelated.  
  Hint    
      
  11.Using several pulleys together is known as a __________.  
  a.   wheel and axle  
  b.   pulley group  
  c.   machine system  
  d.   pulley system  
  Hint    
      
  12.The unit for work is a joule, which is equal to __________.  
  a.   N - m  
  b.   N/m  
  c.   N + m  
  d.   N x m  
  Hint    
      
  13.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   output force times input force  
  c.   input force divided by output force  
  d.   input force times output force  
  Hint    
      
  14.Which of the following do you think a wheel and axle is most closely related to?  
  a.   inclined plane  
  b.   lever  
  c.   wedge  
  d.   pulley  
  Hint    
      
  15.Name the four simple machines.  
  a.   inclined plane, lever, wheel and axle, and pulley  
  b.   wedge, lever, pulley, and wheel  
  c.   screw, lever, wedge, and plane  
  d.   plane, lever, screw, and wedge  
  Hint    
      
  16.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   a lever wrapped around a pole  
  c.   a wedge wrapped around a pipe  
  d.   an inclined plane wrapped around a cylinder  
  Hint    
      
  17.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   the same force  
  c.   no force  
  d.   a lesser force  
  Hint    
      
  18.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   50  
  c.   1000  
  d.   200  
  Hint    
      
  19.The efficiency of all machines is __________.  
  a.   more than 100 percent  
  b.   exactly 100 percent  
  c.   impossible to calculate  
  d.   less than 100 percent  
  Hint    
      
  20.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   plane and lever  
  c.   lever only  
  d.   wedge and plane  
  Hint    

 
   
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