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Work and Simple Machines

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

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