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Work and Simple Machines

Practice Test
  1.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   more than 100 percent  
  c.   impossible to calculate  
  d.   less than 100 percent  
  2.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   the same force  
  c.   a lesser force  
  d.   no force  
  3.Mechanical advantage is equal to __________.  
  a.   input force times output force  
  b.   output force times input force  
  c.   input force divided by output force  
  d.   output force divided by input force  
  4.What is a sign that work is being done?  
  a.   motion  
  b.   matter  
  c.   mass  
  d.   density  
  5.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.   moving the blocks across the desert  
  b.   No work was done in a scientific sense.  
  c.   when lifting the blocks and when moving them across the desert  
  d.   lifting the blocks  
  6.A chisel is an example of which machine?  
  a.   lever  
  b.   pulley  
  c.   wheel and axle  
  d.   wedge  
  7.Name the four simple machines.  
  a.   screw, lever, wedge, and plane  
  b.   wedge, lever, pulley, and wheel  
  c.   plane, lever, screw, and wedge  
  d.   inclined plane, lever, wheel and axle, and pulley  
  8.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   plane and lever  
  c.   wedge and plane  
  d.   screw and pulley  
  9.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   a wedge wrapped around a pipe  
  c.   a lever wrapped around a pole  
  d.   an inclined plane wrapped around a cylinder  
  10.What is transferred when work is done?  
  a.   mass  
  b.   velocity  
  c.   matter  
  d.   energy  
  11.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It decreases.  
  b.   It stays the same.  
  c.   It stops.  
  d.   It increases.  
  12.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50,000 J  
  b.   500 J  
  c.   50 J  
  d.   5,000 J  
  13.Using several pulleys together is known as a __________.  
  a.   wheel and axle  
  b.   pulley group  
  c.   pulley system  
  d.   machine system  
  14.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   wheel and axle  
  c.   lever  
  d.   pulley  
  15.Which is an example of work being done in a scientific sense?  
  a.   lifting a box  
  b.   doing homework  
  c.   pushing against a stationary box  
  d.   carrying a box  
  16.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 decreases.  
  d.   It stays the same.  
  17.Power is measured by which units?  
  a.   newtons  
  b.   watts  
  c.   newton-meters  
  d.   joules  
  18.On what point does a lever pivot?  
  a.   the arm  
  b.   the fulcrum  
  c.   the end  
  d.   the middle  
  19.The unit for work is a joule, which is equal to __________.  
  a.   N + m  
  b.   N/m  
  c.   N - m  
  d.   N x m  
  20.Which of the following do you think a wheel and axle is most closely related to?  
  a.   pulley  
  b.   wedge  
  c.   inclined plane  
  d.   lever  

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