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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.   lever  
  c.   pulley  
  d.   wedge  
  Hint    
      
  2.The efficiency of all machines is __________.  
  a.   less than 100 percent  
  b.   impossible to calculate  
  c.   more than 100 percent  
  d.   exactly 100 percent  
  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.   doing homework  
  d.   lifting a box  
  Hint    
      
  4.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   no force  
  c.   a greater force  
  d.   the same force  
  Hint    
      
  5.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   4  
  c.   50  
  d.   1000  
  Hint    
      
  6.Power is measured by which units?  
  a.   joules  
  b.   watts  
  c.   newton-meters  
  d.   newtons  
  Hint    
      
  7.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   upward  
  b.   along the hallway  
  c.   downward  
  d.   in the opposite direction that you walk  
  Hint    
      
  8.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    
      
  9.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   50 J  
  c.   5,000 J  
  d.   50,000 J  
  Hint    
      
  10.On what point does a lever pivot?  
  a.   the end  
  b.   the fulcrum  
  c.   the arm  
  d.   the middle  
  Hint    
      
  11.How do input force and output force relate to each other?  
  a.   They are always different.  
  b.   They are unrelated.  
  c.   They are the same.  
  d.   The input is always less than the output.  
  Hint    
      
  12.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    
      
  13.A chisel is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   pulley  
  d.   wheel and axle  
  Hint    
      
  14.What is the scientific formula for work?  
  a.   W = F x d  
  b.   W = F - d  
  c.   W = F/d  
  d.   W = F + d  
  Hint    
      
  15.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    
      
  16.Which of the following do you think a wheel and axle is most closely related to?  
  a.   wedge  
  b.   inclined plane  
  c.   lever  
  d.   pulley  
  Hint    
      
  17.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   wedge and plane  
  c.   plane and lever  
  d.   lever only  
  Hint    
      
  18.What is a sign that work is being done?  
  a.   density  
  b.   mass  
  c.   motion  
  d.   matter  
  Hint    
      
  19.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   wheel and axle  
  c.   pulley system  
  d.   pulley group  
  Hint    
      
  20.What is transferred when work is done?  
  a.   mass  
  b.   energy  
  c.   velocity  
  d.   matter  
  Hint    

 
   
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