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Work and Simple Machines

Practice Test
      
  1.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    
      
  2.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50 J  
  b.   5,000 J  
  c.   500 J  
  d.   50,000 J  
  Hint    
      
  3.Which is an example of work being done in a scientific sense?  
  a.   pushing against a stationary box  
  b.   carrying a box  
  c.   lifting a box  
  d.   doing homework  
  Hint    
      
  4.How do input force and output force relate to each other?  
  a.   They are always different.  
  b.   They are the same.  
  c.   The input is always less than the output.  
  d.   They are unrelated.  
  Hint    
      
  5.On what point does a lever pivot?  
  a.   the end  
  b.   the arm  
  c.   the middle  
  d.   the fulcrum  
  Hint    
      
  6.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   wedge and plane  
  c.   screw and pulley  
  d.   plane and lever  
  Hint    
      
  7.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   along the hallway  
  b.   downward  
  c.   upward  
  d.   in the opposite direction that you walk  
  Hint    
      
  8.Which of the following do you think a wheel and axle is most closely related to?  
  a.   pulley  
  b.   wedge  
  c.   lever  
  d.   inclined plane  
  Hint    
      
  9.Power is measured by which units?  
  a.   watts  
  b.   joules  
  c.   newtons  
  d.   newton-meters  
  Hint    
      
  10.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    
      
  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 increases.  
  c.   It decreases.  
  d.   It stays the same.  
  Hint    
      
  12.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   1000  
  b.   200  
  c.   50  
  d.   4  
  Hint    
      
  13.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   wedge  
  c.   lever  
  d.   pulley  
  Hint    
      
  14.Using an inclined plane allows you to apply __________.  
  a.   the same force  
  b.   no force  
  c.   a greater force  
  d.   a lesser force  
  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 decreases.  
  d.   It stops.  
  Hint    
      
  16.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    
      
  17.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   output force divided by input force  
  c.   input force divided by output force  
  d.   output force times input force  
  Hint    
      
  18.The unit for work is a joule, which is equal to __________.  
  a.   N - m  
  b.   N x m  
  c.   N + m  
  d.   N/m  
  Hint    
      
  19.A drill bit is an example of which type of machine?  
  a.   pulley  
  b.   screw  
  c.   wheel and axle  
  d.   lever  
  Hint    
      
  20.What is transferred when work is done?  
  a.   velocity  
  b.   matter  
  c.   mass  
  d.   energy  
  Hint    

 
   
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