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Work and Simple Machines

Practice Test
      
  1.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   upward  
  c.   in the opposite direction that you walk  
  d.   along the hallway  
  Hint    
      
  2.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    
      
  3.Power is measured by which units?  
  a.   newton-meters  
  b.   watts  
  c.   joules  
  d.   newtons  
  Hint    
      
  4.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   50  
  b.   200  
  c.   4  
  d.   1000  
  Hint    
      
  5.What is transferred when work is done?  
  a.   velocity  
  b.   matter  
  c.   energy  
  d.   mass  
  Hint    
      
  6.A ramp in a building is an example of which machine?  
  a.   inclined plane  
  b.   pulley  
  c.   lever  
  d.   wedge  
  Hint    
      
  7.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 increases.  
  d.   It stays the same.  
  Hint    
      
  8.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stops.  
  b.   It decreases.  
  c.   It stays the same.  
  d.   It increases.  
  Hint    
      
  9.How do input force and output force relate to each other?  
  a.   They are the same.  
  b.   The input is always less than the output.  
  c.   They are unrelated.  
  d.   They are always different.  
  Hint    
      
  10.The efficiency of all machines is __________.  
  a.   impossible to calculate  
  b.   less than 100 percent  
  c.   exactly 100 percent  
  d.   more than 100 percent  
  Hint    
      
  11.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   pulley group  
  c.   wheel and axle  
  d.   machine system  
  Hint    
      
  12.Which is an example of work being done in a scientific sense?  
  a.   lifting a box  
  b.   doing homework  
  c.   carrying a box  
  d.   pushing against a stationary box  
  Hint    
      
  13.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50,000 J  
  b.   500 J  
  c.   50 J  
  d.   5,000 J  
  Hint    
      
  14.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   the same force  
  c.   a greater force  
  d.   no force  
  Hint    
      
  15.What does a screw consist of?  
  a.   an inclined plane wrapped around a cylinder  
  b.   a lever wrapped around a pole  
  c.   a wheel and axle in a vertical position  
  d.   a wedge wrapped around a pipe  
  Hint    
      
  16.Mechanical advantage is equal to __________.  
  a.   input force divided by output force  
  b.   output force times input force  
  c.   output force divided by input force  
  d.   input force times output force  
  Hint    
      
  17.A drill bit is an example of which type of machine?  
  a.   pulley  
  b.   screw  
  c.   wheel and axle  
  d.   lever  
  Hint    
      
  18.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    
      
  19.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    
      
  20.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   wedge and plane  
  c.   screw and pulley  
  d.   plane and lever  
  Hint    

 
   
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