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Work and Simple Machines

Practice Test
      
  1.Which of the following do you think a wheel and axle is most closely related to?  
  a.   wedge  
  b.   lever  
  c.   inclined plane  
  d.   pulley  
  Hint    
      
  2.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    
      
  3.Mechanical advantage is equal to __________.  
  a.   input force divided by output force  
  b.   output force divided by input force  
  c.   input force times output force  
  d.   output force times input force  
  Hint    
      
  4.On what point does a lever pivot?  
  a.   the middle  
  b.   the fulcrum  
  c.   the arm  
  d.   the end  
  Hint    
      
  5.Which simple machines are found on a hammer?  
  a.   wedge and plane  
  b.   lever only  
  c.   screw and pulley  
  d.   plane and lever  
  Hint    
      
  6.Power is measured by which units?  
  a.   newtons  
  b.   watts  
  c.   joules  
  d.   newton-meters  
  Hint    
      
  7.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   impossible to calculate  
  c.   more than 100 percent  
  d.   less than 100 percent  
  Hint    
      
  8.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    
      
  9.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   inclined plane  
  d.   pulley  
  Hint    
      
  10.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   pulley  
  c.   wheel and axle  
  d.   lever  
  Hint    
      
  11.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   5,000 J  
  b.   50 J  
  c.   500 J  
  d.   50,000 J  
  Hint    
      
  12.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 increases.  
  c.   It stays the same.  
  d.   It decreases.  
  Hint    
      
  13.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stops.  
  b.   It increases.  
  c.   It stays the same.  
  d.   It decreases.  
  Hint    
      
  14.What is a sign that work is being done?  
  a.   mass  
  b.   motion  
  c.   density  
  d.   matter  
  Hint    
      
  15.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   upward  
  b.   downward  
  c.   along the hallway  
  d.   in the opposite direction that you walk  
  Hint    
      
  16.A chisel is an example of which machine?  
  a.   lever  
  b.   pulley  
  c.   wedge  
  d.   wheel and axle  
  Hint    
      
  17.What is transferred when work is done?  
  a.   matter  
  b.   mass  
  c.   energy  
  d.   velocity  
  Hint    
      
  18.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   50  
  b.   1000  
  c.   200  
  d.   4  
  Hint    
      
  19.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    
      
  20.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   an inclined plane wrapped around a cylinder  
  c.   a wheel and axle in a vertical position  
  d.   a lever wrapped around a pole  
  Hint    

 
   
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