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Work and Simple Machines

Practice Test
      
  1.Name the four simple machines.  
  a.   wedge, lever, pulley, and wheel  
  b.   inclined plane, lever, wheel and axle, and pulley  
  c.   plane, lever, screw, and wedge  
  d.   screw, lever, wedge, and plane  
  Hint    
      
  2.Which is an example of work being done in a scientific sense?  
  a.   lifting a box  
  b.   pushing against a stationary box  
  c.   doing homework  
  d.   carrying a box  
  Hint    
      
  3.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   the same force  
  c.   a lesser force  
  d.   no force  
  Hint    
      
  4.What is transferred when work is done?  
  a.   matter  
  b.   velocity  
  c.   energy  
  d.   mass  
  Hint    
      
  5.What is a sign that work is being done?  
  a.   density  
  b.   matter  
  c.   motion  
  d.   mass  
  Hint    
      
  6.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   wheel and axle  
  c.   pulley system  
  d.   pulley group  
  Hint    
      
  7.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N/m  
  c.   N + m  
  d.   N - m  
  Hint    
      
  8.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   5,000 J  
  b.   50,000 J  
  c.   500 J  
  d.   50 J  
  Hint    
      
  9.A ramp in a building is an example of which machine?  
  a.   inclined plane  
  b.   pulley  
  c.   wedge  
  d.   lever  
  Hint    
      
  10.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the arm  
  c.   the middle  
  d.   the end  
  Hint    
      
  11.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.   lifting the blocks  
  c.   moving the blocks across the desert  
  d.   No work was done in a scientific sense.  
  Hint    
      
  12.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   screw and pulley  
  c.   plane and lever  
  d.   wedge and plane  
  Hint    
      
  13.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   1000  
  b.   50  
  c.   200  
  d.   4  
  Hint    
      
  14.The efficiency of all machines is __________.  
  a.   impossible to calculate  
  b.   more than 100 percent  
  c.   less than 100 percent  
  d.   exactly 100 percent  
  Hint    
      
  15.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   upward  
  b.   in the opposite direction that you walk  
  c.   along the hallway  
  d.   downward  
  Hint    
      
  16.Power is measured by which units?  
  a.   newtons  
  b.   joules  
  c.   watts  
  d.   newton-meters  
  Hint    
      
  17.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    
      
  18.A drill bit is an example of which type of machine?  
  a.   lever  
  b.   pulley  
  c.   wheel and axle  
  d.   screw  
  Hint    
      
  19.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   input force times output force  
  c.   output force times input force  
  d.   input force divided by output force  
  Hint    
      
  20.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    

 
   
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