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Work and Simple Machines

Practice Test
      
  1.How do input force and output force relate to each other?  
  a.   They are unrelated.  
  b.   They are always different.  
  c.   They are the same.  
  d.   The input is always less than the output.  
  Hint    
      
  2.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   machine system  
  c.   wheel and axle  
  d.   pulley group  
  Hint    
      
  3.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    
      
  4.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   upward  
  c.   along the hallway  
  d.   in the opposite direction that you walk  
  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.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   a wedge wrapped around a pipe  
  c.   an inclined plane wrapped around a cylinder  
  d.   a lever wrapped around a pole  
  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.Power is measured by which units?  
  a.   joules  
  b.   newton-meters  
  c.   watts  
  d.   newtons  
  Hint    
      
  9.Which is an example of work being done in a scientific sense?  
  a.   doing homework  
  b.   pushing against a stationary box  
  c.   lifting a box  
  d.   carrying a box  
  Hint    
      
  10.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   input force times output force  
  c.   input force divided by output force  
  d.   output force times input force  
  Hint    
      
  11.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   lever  
  c.   wheel and axle  
  d.   pulley  
  Hint    
      
  12.What is a sign that work is being done?  
  a.   mass  
  b.   matter  
  c.   motion  
  d.   density  
  Hint    
      
  13.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   lever only  
  c.   plane and lever  
  d.   wedge and plane  
  Hint    
      
  14.The efficiency of all machines is __________.  
  a.   impossible to calculate  
  b.   more than 100 percent  
  c.   exactly 100 percent  
  d.   less than 100 percent  
  Hint    
      
  15.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stays the same.  
  b.   It increases.  
  c.   It stops.  
  d.   It decreases.  
  Hint    
      
  16.A ramp in a building is an example of which machine?  
  a.   pulley  
  b.   lever  
  c.   wedge  
  d.   inclined plane  
  Hint    
      
  17.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    
      
  18.What is transferred when work is done?  
  a.   energy  
  b.   matter  
  c.   mass  
  d.   velocity  
  Hint    
      
  19.Which of the following do you think a wheel and axle is most closely related to?  
  a.   inclined plane  
  b.   wedge  
  c.   lever  
  d.   pulley  
  Hint    
      
  20.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It decreases.  
  b.   It goes to zero.  
  c.   It increases.  
  d.   It stays the same.  
  Hint    

 
   
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