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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 x d  
  d.   W = F/d  
  Hint    
      
  2.Which of the following do you think a wheel and axle is most closely related to?  
  a.   wedge  
  b.   lever  
  c.   pulley  
  d.   inclined plane  
  Hint    
      
  3.What does a screw consist of?  
  a.   a lever wrapped around a pole  
  b.   a wheel and axle in a vertical position  
  c.   a wedge wrapped around a pipe  
  d.   an inclined plane wrapped around a cylinder  
  Hint    
      
  4.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   input force times output force  
  c.   input force divided by output force  
  d.   output force divided by input force  
  Hint    
      
  5.A ramp in a building is an example of which machine?  
  a.   pulley  
  b.   inclined plane  
  c.   lever  
  d.   wedge  
  Hint    
      
  6.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    
      
  7.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   5,000 J  
  b.   500 J  
  c.   50 J  
  d.   50,000 J  
  Hint    
      
  8.A chisel is an example of which machine?  
  a.   lever  
  b.   wedge  
  c.   pulley  
  d.   wheel and axle  
  Hint    
      
  9.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   pulley group  
  c.   wheel and axle  
  d.   machine system  
  Hint    
      
  10.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    
      
  11.Which simple machines are found on a hammer?  
  a.   wedge and plane  
  b.   plane and lever  
  c.   screw and pulley  
  d.   lever only  
  Hint    
      
  12.Name the four simple machines.  
  a.   screw, lever, wedge, and plane  
  b.   plane, lever, screw, and wedge  
  c.   wedge, lever, pulley, and wheel  
  d.   inclined plane, lever, wheel and axle, and pulley  
  Hint    
      
  13.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.   lifting the blocks  
  b.   when lifting the blocks and when moving them across the desert  
  c.   No work was done in a scientific sense.  
  d.   moving the blocks across the desert  
  Hint    
      
  14.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   200  
  c.   1000  
  d.   50  
  Hint    
      
  15.A drill bit is an example of which type of machine?  
  a.   pulley  
  b.   wheel and axle  
  c.   screw  
  d.   lever  
  Hint    
      
  16.The efficiency of all machines is __________.  
  a.   more than 100 percent  
  b.   impossible to calculate  
  c.   less than 100 percent  
  d.   exactly 100 percent  
  Hint    
      
  17.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the end  
  c.   the arm  
  d.   the middle  
  Hint    
      
  18.What is transferred when work is done?  
  a.   mass  
  b.   velocity  
  c.   matter  
  d.   energy  
  Hint    
      
  19.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It stays the same.  
  b.   It decreases.  
  c.   It goes to zero.  
  d.   It increases.  
  Hint    
      
  20.Using an inclined plane allows you to apply __________.  
  a.   no force  
  b.   a lesser force  
  c.   a greater force  
  d.   the same force  
  Hint    

 
   
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