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Work and Simple Machines

Practice Test
  1.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N/m  
  c.   N + m  
  d.   N - m  
  2.A chisel is an example of which machine?  
  a.   pulley  
  b.   wedge  
  c.   lever  
  d.   wheel and axle  
  3.Name the four simple machines.  
  a.   plane, lever, screw, and wedge  
  b.   screw, lever, wedge, and plane  
  c.   inclined plane, lever, wheel and axle, and pulley  
  d.   wedge, lever, pulley, and wheel  
  4.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   pulley system  
  c.   wheel and axle  
  d.   machine system  
  5.A drill bit is an example of which type of machine?  
  a.   lever  
  b.   pulley  
  c.   wheel and axle  
  d.   screw  
  6.How do input force and output force relate to each other?  
  a.   The input is always less than the output.  
  b.   They are always different.  
  c.   They are unrelated.  
  d.   They are the same.  
  7.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   an inclined plane wrapped around a cylinder  
  c.   a wedge wrapped around a pipe  
  d.   a lever wrapped around a pole  
  8.The efficiency of all machines is __________.  
  a.   more than 100 percent  
  b.   impossible to calculate  
  c.   exactly 100 percent  
  d.   less than 100 percent  
  9.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.   No work was done in a scientific sense.  
  b.   moving the blocks across the desert  
  c.   when lifting the blocks and when moving them across the desert  
  d.   lifting the blocks  
  10.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   output force times input force  
  c.   output force divided by input force  
  d.   input force divided by output force  
  11.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50 J  
  b.   50,000 J  
  c.   500 J  
  d.   5,000 J  
  12.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   upward  
  c.   along the hallway  
  d.   in the opposite direction that you walk  
  13.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   pulley  
  c.   lever  
  d.   inclined plane  
  14.Which simple machines are found on a hammer?  
  a.   plane and lever  
  b.   wedge and plane  
  c.   screw and pulley  
  d.   lever only  
  15.What is a sign that work is being done?  
  a.   matter  
  b.   mass  
  c.   density  
  d.   motion  
  16.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  
  17.What is transferred when work is done?  
  a.   matter  
  b.   energy  
  c.   velocity  
  d.   mass  
  18.Which is an example of work being done in a scientific sense?  
  a.   pushing against a stationary box  
  b.   doing homework  
  c.   lifting a box  
  d.   carrying a box  
  19.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   the same force  
  c.   no force  
  d.   a greater force  
  20.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.  

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