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Work and Simple Machines

Practice Test
  1.What is a sign that work is being done?  
  a.   density  
  b.   mass  
  c.   motion  
  d.   matter  
  2.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   50 J  
  b.   5,000 J  
  c.   50,000 J  
  d.   500 J  
  3.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 stays the same.  
  d.   It stops.  
  4.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It decreases.  
  b.   It stays the same.  
  c.   It goes to zero.  
  d.   It increases.  
  5.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   in the opposite direction that you walk  
  c.   along the hallway  
  d.   upward  
  6.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   lever  
  c.   wheel and axle  
  d.   pulley  
  7.How do input force and output force relate to each other?  
  a.   They are always different.  
  b.   They are the same.  
  c.   They are unrelated.  
  d.   The input is always less than the output.  
  8.What is the scientific formula for work?  
  a.   W = F/d  
  b.   W = F + d  
  c.   W = F - d  
  d.   W = F x d  
  9.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the middle  
  c.   the end  
  d.   the arm  
  10.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  
  11.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N - m  
  c.   N/m  
  d.   N + m  
  12.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   4  
  b.   1000  
  c.   50  
  d.   200  
  13.Using several pulleys together is known as a __________.  
  a.   wheel and axle  
  b.   machine system  
  c.   pulley group  
  d.   pulley system  
  14.Name the four simple machines.  
  a.   plane, lever, screw, and wedge  
  b.   wedge, lever, pulley, and wheel  
  c.   inclined plane, lever, wheel and axle, and pulley  
  d.   screw, lever, wedge, and plane  
  15.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   a greater force  
  c.   no force  
  d.   the same force  
  16.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   inclined plane  
  c.   pulley  
  d.   wedge  
  17.What does a screw consist of?  
  a.   a lever wrapped around a pole  
  b.   a wedge wrapped around a pipe  
  c.   an inclined plane wrapped around a cylinder  
  d.   a wheel and axle in a vertical position  
  18.Power is measured by which units?  
  a.   newton-meters  
  b.   newtons  
  c.   watts  
  d.   joules  
  19.What is transferred when work is done?  
  a.   velocity  
  b.   mass  
  c.   matter  
  d.   energy  
  20.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   less than 100 percent  
  c.   more than 100 percent  
  d.   impossible to calculate  

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