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Work and Simple Machines

Practice Test
      
  1.Power is measured by which units?  
  a.   newtons  
  b.   newton-meters  
  c.   watts  
  d.   joules  
  Hint    
      
  2.A chisel is an example of which machine?  
  a.   pulley  
  b.   lever  
  c.   wheel and axle  
  d.   wedge  
  Hint    
      
  3.Which of the following do you think a wheel and axle is most closely related to?  
  a.   inclined plane  
  b.   wedge  
  c.   pulley  
  d.   lever  
  Hint    
      
  4.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It increases.  
  b.   It decreases.  
  c.   It stops.  
  d.   It stays the same.  
  Hint    
      
  5.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.   when lifting the blocks and when moving them across the desert  
  b.   moving the blocks across the desert  
  c.   No work was done in a scientific sense.  
  d.   lifting the blocks  
  Hint    
      
  6.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   the same force  
  c.   a greater force  
  d.   no force  
  Hint    
      
  7.What is a sign that work is being done?  
  a.   matter  
  b.   motion  
  c.   density  
  d.   mass  
  Hint    
      
  8.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    
      
  9.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   wedge and plane  
  c.   plane and lever  
  d.   lever only  
  Hint    
      
  10.What does a screw consist of?  
  a.   a lever wrapped around a pole  
  b.   an inclined plane wrapped around a cylinder  
  c.   a wheel and axle in a vertical position  
  d.   a wedge wrapped around a pipe  
  Hint    
      
  11.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 stays the same.  
  c.   It increases.  
  d.   It decreases.  
  Hint    
      
  12.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   50 J  
  c.   5,000 J  
  d.   50,000 J  
  Hint    
      
  13.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   input force divided by output force  
  c.   output force divided by input force  
  d.   output force times input force  
  Hint    
      
  14.The unit for work is a joule, which is equal to __________.  
  a.   N/m  
  b.   N - m  
  c.   N + m  
  d.   N x m  
  Hint    
      
  15.A ramp in a building is an example of which machine?  
  a.   inclined plane  
  b.   wedge  
  c.   pulley  
  d.   lever  
  Hint    
      
  16.What is the scientific formula for work?  
  a.   W = F + d  
  b.   W = F x d  
  c.   W = F - d  
  d.   W = F/d  
  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.   downward  
  d.   in the opposite direction that you walk  
  Hint    
      
  18.On what point does a lever pivot?  
  a.   the end  
  b.   the arm  
  c.   the middle  
  d.   the fulcrum  
  Hint    
      
  19.What is transferred when work is done?  
  a.   energy  
  b.   velocity  
  c.   matter  
  d.   mass  
  Hint    
      
  20.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   machine system  
  c.   pulley group  
  d.   wheel and axle  
  Hint    

 
   
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