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Work and Simple Machines

Practice Test
  1.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   wedge  
  c.   pulley  
  d.   lever  
  2.What is transferred when work is done?  
  a.   mass  
  b.   matter  
  c.   energy  
  d.   velocity  
  3.What does a screw consist of?  
  a.   an inclined plane wrapped around a cylinder  
  b.   a wheel and axle in a vertical position  
  c.   a wedge wrapped around a pipe  
  d.   a lever wrapped around a pole  
  4.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   1000  
  c.   50  
  d.   4  
  5.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50,000 J  
  b.   5,000 J  
  c.   50 J  
  d.   500 J  
  6.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   inclined plane  
  c.   wedge  
  d.   pulley  
  7.What is the scientific formula for work?  
  a.   W = F x d  
  b.   W = F - d  
  c.   W = F/d  
  d.   W = F + d  
  8.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   wedge  
  c.   pulley  
  d.   inclined plane  
  9.The unit for work is a joule, which is equal to __________.  
  a.   N - m  
  b.   N + m  
  c.   N x m  
  d.   N/m  
  10.Which is an example of work being done in a scientific sense?  
  a.   lifting a box  
  b.   carrying a box  
  c.   pushing against a stationary box  
  d.   doing homework  
  11.Using several pulleys together is known as a __________.  
  a.   wheel and axle  
  b.   pulley group  
  c.   machine system  
  d.   pulley system  
  12.What is a sign that work is being done?  
  a.   motion  
  b.   matter  
  c.   mass  
  d.   density  
  13.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.   lifting the blocks  
  c.   moving the blocks across the desert  
  d.   when lifting the blocks and when moving them across the desert  
  14.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   input force times output force  
  c.   input force divided by output force  
  d.   output force times input force  
  15.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  
  16.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the end  
  c.   the arm  
  d.   the middle  
  17.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.  
  18.Power is measured by which units?  
  a.   newtons  
  b.   newton-meters  
  c.   watts  
  d.   joules  
  19.Which simple machines are found on a hammer?  
  a.   lever only  
  b.   plane and lever  
  c.   screw and pulley  
  d.   wedge and plane  
  20.The efficiency of all machines is __________.  
  a.   impossible to calculate  
  b.   less than 100 percent  
  c.   more than 100 percent  
  d.   exactly 100 percent  

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