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Work and Simple Machines

Practice Test
      
  1.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.   moving the blocks across the desert  
  c.   when lifting the blocks and when moving them across the desert  
  d.   No work was done in a scientific sense.  
  Hint    
      
  2.Which is an example of work being done in a scientific sense?  
  a.   carrying a box  
  b.   doing homework  
  c.   lifting a box  
  d.   pushing against a stationary box  
  Hint    
      
  3.What is a sign that work is being done?  
  a.   motion  
  b.   density  
  c.   matter  
  d.   mass  
  Hint    
      
  4.Name the four simple machines.  
  a.   wedge, lever, pulley, and wheel  
  b.   plane, lever, screw, and wedge  
  c.   screw, lever, wedge, and plane  
  d.   inclined plane, lever, wheel and axle, and pulley  
  Hint    
      
  5.What is transferred when work is done?  
  a.   mass  
  b.   matter  
  c.   energy  
  d.   velocity  
  Hint    
      
  6.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   input force divided by output force  
  c.   input force times output force  
  d.   output force times input force  
  Hint    
      
  7.What does a screw consist of?  
  a.   an inclined plane wrapped around a cylinder  
  b.   a wheel and axle in a vertical position  
  c.   a wedge wrapped around a pipe  
  d.   a lever wrapped around a pole  
  Hint    
      
  8.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    
      
  9.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    
      
  10.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.   downward  
  d.   along the hallway  
  Hint    
      
  11.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   a lesser force  
  c.   no force  
  d.   the same force  
  Hint    
      
  12.How do input force and output force relate to each other?  
  a.   They are always different.  
  b.   They are unrelated.  
  c.   The input is always less than the output.  
  d.   They are the same.  
  Hint    
      
  13.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 decreases.  
  c.   It stays the same.  
  d.   It increases.  
  Hint    
      
  14.A chisel is an example of which machine?  
  a.   pulley  
  b.   lever  
  c.   wedge  
  d.   wheel and axle  
  Hint    
      
  15.Which of the following do you think a wheel and axle is most closely related to?  
  a.   pulley  
  b.   wedge  
  c.   inclined plane  
  d.   lever  
  Hint    
      
  16.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   pulley  
  c.   inclined plane  
  d.   lever  
  Hint    
      
  17.A drill bit is an example of which type of machine?  
  a.   wheel and axle  
  b.   pulley  
  c.   screw  
  d.   lever  
  Hint    
      
  18.On what point does a lever pivot?  
  a.   the middle  
  b.   the arm  
  c.   the end  
  d.   the fulcrum  
  Hint    
      
  19.Using several pulleys together is known as a __________.  
  a.   wheel and axle  
  b.   machine system  
  c.   pulley group  
  d.   pulley system  
  Hint    
      
  20.Power is measured by which units?  
  a.   newtons  
  b.   watts  
  c.   joules  
  d.   newton-meters  
  Hint    

 
   
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