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Work and Simple Machines

Practice Test
      
  1.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   lever only  
  c.   wedge and plane  
  d.   plane and lever  
  Hint    
      
  2.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50 J  
  b.   5,000 J  
  c.   50,000 J  
  d.   500 J  
  Hint    
      
  3.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   pulley  
  c.   inclined plane  
  d.   wedge  
  Hint    
      
  4.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    
      
  5.Which is an example of work being done in a scientific sense?  
  a.   doing homework  
  b.   pushing against a stationary box  
  c.   lifting a box  
  d.   carrying a box  
  Hint    
      
  6.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   50  
  c.   1000  
  d.   200  
  Hint    
      
  7.A chisel is an example of which machine?  
  a.   wedge  
  b.   wheel and axle  
  c.   pulley  
  d.   lever  
  Hint    
      
  8.The efficiency of all machines is __________.  
  a.   less than 100 percent  
  b.   more than 100 percent  
  c.   exactly 100 percent  
  d.   impossible to calculate  
  Hint    
      
  9.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   pulley  
  c.   lever  
  d.   wheel and axle  
  Hint    
      
  10.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   a wheel and axle in a vertical position  
  c.   an inclined plane wrapped around a cylinder  
  d.   a lever wrapped around a pole  
  Hint    
      
  11.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 decreases.  
  c.   It goes to zero.  
  d.   It stays the same.  
  Hint    
      
  12.Name the four simple machines.  
  a.   wedge, lever, pulley, and wheel  
  b.   inclined plane, lever, wheel and axle, and pulley  
  c.   screw, lever, wedge, and plane  
  d.   plane, lever, screw, and wedge  
  Hint    
      
  13.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   pulley system  
  c.   wheel and axle  
  d.   pulley group  
  Hint    
      
  14.What is a sign that work is being done?  
  a.   density  
  b.   mass  
  c.   matter  
  d.   motion  
  Hint    
      
  15.The unit for work is a joule, which is equal to __________.  
  a.   N + m  
  b.   N x m  
  c.   N - m  
  d.   N/m  
  Hint    
      
  16.Power is measured by which units?  
  a.   joules  
  b.   newton-meters  
  c.   watts  
  d.   newtons  
  Hint    
      
  17.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   along the hallway  
  b.   upward  
  c.   in the opposite direction that you walk  
  d.   downward  
  Hint    
      
  18.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   output force times input force  
  c.   input force divided by output force  
  d.   output force divided by input force  
  Hint    
      
  19.What is transferred when work is done?  
  a.   matter  
  b.   energy  
  c.   velocity  
  d.   mass  
  Hint    
      
  20.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    

 
   
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