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Work and Simple Machines

Practice Test
  1.What is transferred when work is done?  
  a.   matter  
  b.   energy  
  c.   mass  
  d.   velocity  
  2.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   along the hallway  
  b.   in the opposite direction that you walk  
  c.   downward  
  d.   upward  
  3.Which of the following do you think a wheel and axle is most closely related to?  
  a.   inclined plane  
  b.   pulley  
  c.   lever  
  d.   wedge  
  4.The efficiency of all machines is __________.  
  a.   less than 100 percent  
  b.   more than 100 percent  
  c.   impossible to calculate  
  d.   exactly 100 percent  
  5.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   machine system  
  c.   wheel and axle  
  d.   pulley system  
  6.Name the four simple machines.  
  a.   plane, lever, screw, and wedge  
  b.   inclined plane, lever, wheel and axle, and pulley  
  c.   wedge, lever, pulley, and wheel  
  d.   screw, lever, wedge, and plane  
  7.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   input force divided by output force  
  c.   input force times output force  
  d.   output force divided by input force  
  8.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   wedge  
  c.   pulley  
  d.   inclined plane  
  9.What is a sign that work is being done?  
  a.   density  
  b.   mass  
  c.   motion  
  d.   matter  
  10.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  
  11.The unit for work is a joule, which is equal to __________.  
  a.   N/m  
  b.   N + m  
  c.   N - m  
  d.   N x m  
  12.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  
  13.A chisel is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   wheel and axle  
  d.   pulley  
  14.Which simple machines are found on a hammer?  
  a.   screw and pulley  
  b.   plane and lever  
  c.   lever only  
  d.   wedge and plane  
  15.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   200  
  c.   1000  
  d.   50  
  16.Power is measured by which units?  
  a.   joules  
  b.   newton-meters  
  c.   watts  
  d.   newtons  
  17.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   a lesser force  
  c.   no force  
  d.   the same force  
  18.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It stays the same.  
  b.   It increases.  
  c.   It goes to zero.  
  d.   It decreases.  
  19.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   an inclined plane wrapped around a cylinder  
  c.   a lever wrapped around a pole  
  d.   a wheel and axle in a vertical position  
  20.How do input force and output force relate to each other?  
  a.   The input is always less than the output.  
  b.   They are unrelated.  
  c.   They are the same.  
  d.   They are always different.  

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