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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.   pulley  
  b.   inclined plane  
  c.   lever  
  d.   wedge  
  2.Which is an example of work being done in a scientific sense?  
  a.   lifting a box  
  b.   pushing against a stationary box  
  c.   carrying a box  
  d.   doing homework  
  3.The unit for work is a joule, which is equal to __________.  
  a.   N/m  
  b.   N x m  
  c.   N - m  
  d.   N + m  
  4.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   pulley  
  c.   lever  
  d.   wedge  
  5.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It decreases.  
  b.   It stops.  
  c.   It stays the same.  
  d.   It increases.  
  6.Mechanical advantage is equal to __________.  
  a.   input force divided by output force  
  b.   output force divided by input force  
  c.   output force times input force  
  d.   input force times output force  
  7.Name the four simple machines.  
  a.   screw, lever, wedge, and plane  
  b.   inclined plane, lever, wheel and axle, and pulley  
  c.   wedge, lever, pulley, and wheel  
  d.   plane, lever, screw, and wedge  
  8.How do input force and output force relate to each other?  
  a.   The input is always less than the output.  
  b.   They are the same.  
  c.   They are always different.  
  d.   They are unrelated.  
  9.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   along the hallway  
  c.   in the opposite direction that you walk  
  d.   upward  
  10.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   wedge and plane  
  c.   plane and lever  
  d.   screw and pulley  
  11.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.   lifting the blocks  
  b.   moving the blocks across the desert  
  c.   when lifting the blocks and when moving them across the desert  
  d.   No work was done in a scientific sense.  
  12.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   5,000 J  
  c.   50 J  
  d.   50,000 J  
  13.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   50  
  c.   1000  
  d.   200  
  14.What is the scientific formula for work?  
  a.   W = F x d  
  b.   W = F/d  
  c.   W = F - d  
  d.   W = F + d  
  15.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   machine system  
  c.   wheel and axle  
  d.   pulley system  
  16.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  
  17.What is a sign that work is being done?  
  a.   motion  
  b.   matter  
  c.   mass  
  d.   density  
  18.What is transferred when work is done?  
  a.   energy  
  b.   velocity  
  c.   matter  
  d.   mass  
  19.The efficiency of all machines is __________.  
  a.   less than 100 percent  
  b.   more than 100 percent  
  c.   impossible to calculate  
  d.   exactly 100 percent  
  20.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It decreases.  
  b.   It stays the same.  
  c.   It increases.  
  d.   It goes to zero.  

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