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Work and Simple Machines

Practice Test
      
  1.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   lever  
  c.   pulley  
  d.   wedge  
  Hint    
      
  2.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It increases.  
  b.   It goes to zero.  
  c.   It stays the same.  
  d.   It decreases.  
  Hint    
      
  3.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   in the opposite direction that you walk  
  b.   downward  
  c.   upward  
  d.   along the hallway  
  Hint    
      
  4.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   input force divided by output force  
  c.   output force divided by input force  
  d.   input force times output force  
  Hint    
      
  5.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    
      
  6.What is transferred when work is done?  
  a.   velocity  
  b.   mass  
  c.   matter  
  d.   energy  
  Hint    
      
  7.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    
      
  8.On what point does a lever pivot?  
  a.   the middle  
  b.   the end  
  c.   the arm  
  d.   the fulcrum  
  Hint    
      
  9.Power is measured by which units?  
  a.   newtons  
  b.   watts  
  c.   newton-meters  
  d.   joules  
  Hint    
      
  10.What is a sign that work is being done?  
  a.   motion  
  b.   matter  
  c.   density  
  d.   mass  
  Hint    
      
  11.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   wedge  
  c.   pulley  
  d.   inclined plane  
  Hint    
      
  12.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.   moving the blocks across the desert  
  b.   when lifting the blocks and when moving them across the desert  
  c.   lifting the blocks  
  d.   No work was done in a scientific sense.  
  Hint    
      
  13.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    
      
  14.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   1000  
  c.   50  
  d.   4  
  Hint    
      
  15.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   plane and lever  
  c.   lever only  
  d.   wedge and plane  
  Hint    
      
  16.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    
      
  17.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   machine system  
  c.   wheel and axle  
  d.   pulley group  
  Hint    
      
  18.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   50,000 J  
  c.   50 J  
  d.   5,000 J  
  Hint    
      
  19.Which is an example of work being done in a scientific sense?  
  a.   pushing against a stationary box  
  b.   doing homework  
  c.   carrying a box  
  d.   lifting a box  
  Hint    
      
  20.A drill bit is an example of which type of machine?  
  a.   lever  
  b.   screw  
  c.   wheel and axle  
  d.   pulley  
  Hint    

 
   
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