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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.Power is measured by which units?  
  a.   watts  
  b.   joules  
  c.   newton-meters  
  d.   newtons  
  Hint    
      
  3.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.   No work was done in a scientific sense.  
  c.   when lifting the blocks and when moving them across the desert  
  d.   lifting the blocks  
  Hint    
      
  4.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    
      
  5.A ramp in a building is an example of which machine?  
  a.   pulley  
  b.   inclined plane  
  c.   wedge  
  d.   lever  
  Hint    
      
  6.What is transferred when work is done?  
  a.   matter  
  b.   velocity  
  c.   energy  
  d.   mass  
  Hint    
      
  7.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   a wedge wrapped around a pipe  
  c.   a lever wrapped around a pole  
  d.   an inclined plane wrapped around a cylinder  
  Hint    
      
  8.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   along the hallway  
  b.   downward  
  c.   in the opposite direction that you walk  
  d.   upward  
  Hint    
      
  9.The unit for work is a joule, which is equal to __________.  
  a.   N - m  
  b.   N/m  
  c.   N x m  
  d.   N + m  
  Hint    
      
  10.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   impossible to calculate  
  c.   less than 100 percent  
  d.   more than 100 percent  
  Hint    
      
  11.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   output force divided by input force  
  c.   input force divided by output force  
  d.   input force times output force  
  Hint    
      
  12.A drill bit is an example of which type of machine?  
  a.   pulley  
  b.   wheel and axle  
  c.   screw  
  d.   lever  
  Hint    
      
  13.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    
      
  14.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the middle  
  c.   the end  
  d.   the arm  
  Hint    
      
  15.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   the same force  
  c.   a lesser force  
  d.   no force  
  Hint    
      
  16.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   1000  
  c.   200  
  d.   50  
  Hint    
      
  17.What is a sign that work is being done?  
  a.   matter  
  b.   density  
  c.   motion  
  d.   mass  
  Hint    
      
  18.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   wedge  
  c.   lever  
  d.   pulley  
  Hint    
      
  19.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It increases.  
  b.   It stops.  
  c.   It decreases.  
  d.   It stays the same.  
  Hint    
      
  20.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   plane and lever  
  c.   wedge and plane  
  d.   screw and pulley  
  Hint    

 
   
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