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Work and Simple Machines

Practice Test
  1.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50 J  
  b.   500 J  
  c.   5,000 J  
  d.   50,000 J  
  2.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N - m  
  c.   N/m  
  d.   N + m  
  3.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stays the same.  
  b.   It increases.  
  c.   It stops.  
  d.   It decreases.  
  4.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   wedge and plane  
  c.   plane and lever  
  d.   screw and pulley  
  5.What is transferred when work is done?  
  a.   matter  
  b.   energy  
  c.   velocity  
  d.   mass  
  6.How do input force and output force relate to each other?  
  a.   They are always different.  
  b.   The input is always less than the output.  
  c.   They are unrelated.  
  d.   They are the same.  
  7.Name the four simple machines.  
  a.   wedge, lever, pulley, and wheel  
  b.   screw, lever, wedge, and plane  
  c.   inclined plane, lever, wheel and axle, and pulley  
  d.   plane, lever, screw, and wedge  
  8.What is a sign that work is being done?  
  a.   density  
  b.   mass  
  c.   matter  
  d.   motion  
  9.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   pulley group  
  c.   wheel and axle  
  d.   pulley system  
  10.Power is measured by which units?  
  a.   joules  
  b.   watts  
  c.   newton-meters  
  d.   newtons  
  11.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   1000  
  c.   200  
  d.   50  
  12.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   a wheel and axle in a vertical position  
  c.   a lever wrapped around a pole  
  d.   an inclined plane wrapped around a cylinder  
  13.Which of the following do you think a wheel and axle is most closely related to?  
  a.   wedge  
  b.   lever  
  c.   pulley  
  d.   inclined plane  
  14.Which is an example of work being done in a scientific sense?  
  a.   pushing against a stationary box  
  b.   lifting a box  
  c.   doing homework  
  d.   carrying a box  
  15.Using an inclined plane allows you to apply __________.  
  a.   no force  
  b.   the same force  
  c.   a lesser force  
  d.   a greater force  
  16.On what point does a lever pivot?  
  a.   the end  
  b.   the middle  
  c.   the arm  
  d.   the fulcrum  
  17.A chisel is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   wheel and axle  
  d.   pulley  
  18.A drill bit is an example of which type of machine?  
  a.   wheel and axle  
  b.   lever  
  c.   pulley  
  d.   screw  
  19.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   in the opposite direction that you walk  
  b.   upward  
  c.   along the hallway  
  d.   downward  
  20.What is the scientific formula for work?  
  a.   W = F/d  
  b.   W = F + d  
  c.   W = F - d  
  d.   W = F x d  

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