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Work and Simple Machines

Practice Test
      
  1.What is a sign that work is being done?  
  a.   motion  
  b.   matter  
  c.   mass  
  d.   density  
  Hint    
      
  2.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   along the hallway  
  c.   in the opposite direction that you walk  
  d.   upward  
  Hint    
      
  3.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   no force  
  c.   the same force  
  d.   a greater force  
  Hint    
      
  4.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   wedge and plane  
  c.   plane and lever  
  d.   lever only  
  Hint    
      
  5.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the middle  
  c.   the arm  
  d.   the end  
  Hint    
      
  6.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   pulley  
  c.   wheel and axle  
  d.   lever  
  Hint    
      
  7.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   wheel and axle  
  c.   machine system  
  d.   pulley group  
  Hint    
      
  8.What is the scientific formula for work?  
  a.   W = F - d  
  b.   W = F + d  
  c.   W = F x d  
  d.   W = F/d  
  Hint    
      
  9.Name the four simple machines.  
  a.   inclined plane, lever, wheel and axle, and pulley  
  b.   screw, lever, wedge, and plane  
  c.   wedge, lever, pulley, and wheel  
  d.   plane, lever, screw, and wedge  
  Hint    
      
  10.How do input force and output force relate to each other?  
  a.   They are the same.  
  b.   They are unrelated.  
  c.   They are always different.  
  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.   1000  
  b.   4  
  c.   200  
  d.   50  
  Hint    
      
  12.Which is an example of work being done in a scientific sense?  
  a.   lifting a box  
  b.   carrying a box  
  c.   doing homework  
  d.   pushing against a stationary box  
  Hint    
      
  13.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 stays the same.  
  c.   It goes to zero.  
  d.   It increases.  
  Hint    
      
  14.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   output force divided by input force  
  c.   input force times output force  
  d.   input force divided by output force  
  Hint    
      
  15.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50 J  
  b.   50,000 J  
  c.   500 J  
  d.   5,000 J  
  Hint    
      
  16.Power is measured by which units?  
  a.   newton-meters  
  b.   joules  
  c.   watts  
  d.   newtons  
  Hint    
      
  17.A chisel is an example of which machine?  
  a.   wedge  
  b.   wheel and axle  
  c.   lever  
  d.   pulley  
  Hint    
      
  18.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It decreases.  
  b.   It stays the same.  
  c.   It increases.  
  d.   It stops.  
  Hint    
      
  19.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    
      
  20.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    

 
   
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