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Work and Simple Machines

Practice Test
  1.Power is measured by which units?  
  a.   watts  
  b.   joules  
  c.   newton-meters  
  d.   newtons  
  2.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.   No work was done in a scientific sense.  
  c.   moving the blocks across the desert  
  d.   lifting the blocks  
  3.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It increases.  
  b.   It stays the same.  
  c.   It stops.  
  d.   It decreases.  
  4.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   in the opposite direction that you walk  
  b.   upward  
  c.   along the hallway  
  d.   downward  
  5.What is a sign that work is being done?  
  a.   motion  
  b.   density  
  c.   matter  
  d.   mass  
  6.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   lever  
  c.   pulley  
  d.   wedge  
  7.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 decreases.  
  c.   It increases.  
  d.   It stays the same.  
  8.Which of the following do you think a wheel and axle is most closely related to?  
  a.   wedge  
  b.   pulley  
  c.   inclined plane  
  d.   lever  
  9.On what point does a lever pivot?  
  a.   the end  
  b.   the fulcrum  
  c.   the middle  
  d.   the arm  
  10.Using an inclined plane allows you to apply __________.  
  a.   a greater force  
  b.   the same force  
  c.   a lesser force  
  d.   no force  
  11.What is transferred when work is done?  
  a.   energy  
  b.   velocity  
  c.   matter  
  d.   mass  
  12.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   50  
  b.   1000  
  c.   200  
  d.   4  
  13.How do input force and output force relate to each other?  
  a.   They are unrelated.  
  b.   They are the same.  
  c.   The input is always less than the output.  
  d.   They are always different.  
  14.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 lever wrapped around a pole  
  d.   a wedge wrapped around a pipe  
  15.Mechanical advantage is equal to __________.  
  a.   output force divided by input force  
  b.   input force times output force  
  c.   output force times input force  
  d.   input force divided by output force  
  16.What is the scientific formula for work?  
  a.   W = F/d  
  b.   W = F x d  
  c.   W = F + d  
  d.   W = F - d  
  17.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  
  18.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   pulley system  
  c.   machine system  
  d.   wheel and axle  
  19.The efficiency of all machines is __________.  
  a.   impossible to calculate  
  b.   less than 100 percent  
  c.   exactly 100 percent  
  d.   more than 100 percent  
  20.The unit for work is a joule, which is equal to __________.  
  a.   N + m  
  b.   N x m  
  c.   N/m  
  d.   N - m  

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