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Work and Simple Machines

Practice Test
  1.What is a sign that work is being done?  
  a.   matter  
  b.   motion  
  c.   mass  
  d.   density  
  2.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   pulley  
  c.   wedge  
  d.   lever  
  3.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stops.  
  b.   It increases.  
  c.   It stays the same.  
  d.   It decreases.  
  4.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   inclined plane  
  c.   wedge  
  d.   pulley  
  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.   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.  
  6.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   upward  
  b.   in the opposite direction that you walk  
  c.   along the hallway  
  d.   downward  
  7.Which is an example of work being done in a scientific sense?  
  a.   doing homework  
  b.   pushing against a stationary box  
  c.   carrying a box  
  d.   lifting a box  
  8.What is transferred when work is done?  
  a.   mass  
  b.   matter  
  c.   velocity  
  d.   energy  
  9.Power is measured by which units?  
  a.   watts  
  b.   joules  
  c.   newtons  
  d.   newton-meters  
  10.The efficiency of all machines is __________.  
  a.   more than 100 percent  
  b.   impossible to calculate  
  c.   exactly 100 percent  
  d.   less than 100 percent  
  11.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   pulley group  
  c.   wheel and axle  
  d.   pulley system  
  12.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   50  
  b.   1000  
  c.   4  
  d.   200  
  13.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  
  14.On what point does a lever pivot?  
  a.   the middle  
  b.   the fulcrum  
  c.   the end  
  d.   the arm  
  15.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.  
  16.Name the four simple machines.  
  a.   inclined plane, lever, wheel and axle, and pulley  
  b.   screw, lever, wedge, and plane  
  c.   plane, lever, screw, and wedge  
  d.   wedge, lever, pulley, and wheel  
  17.How do input force and output force relate to each other?  
  a.   The input is always less than the output.  
  b.   They are always different.  
  c.   They are the same.  
  d.   They are unrelated.  
  18.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   input force divided by output force  
  c.   input force times output force  
  d.   output force times input force  
  19.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  
  20.What is the scientific formula for work?  
  a.   W = F + d  
  b.   W = F/d  
  c.   W = F - d  
  d.   W = F x d  

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