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Work and Simple Machines

Practice Test
  1.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  
  2.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   inclined plane  
  c.   pulley  
  d.   lever  
  3.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   a greater force  
  c.   the same force  
  d.   no force  
  4.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stays the same.  
  b.   It decreases.  
  c.   It stops.  
  d.   It increases.  
  5.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   50  
  b.   1000  
  c.   200  
  d.   4  
  6.What does a screw consist of?  
  a.   a lever wrapped around a pole  
  b.   a wedge wrapped around a pipe  
  c.   a wheel and axle in a vertical position  
  d.   an inclined plane wrapped around a cylinder  
  7.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   wedge  
  c.   inclined plane  
  d.   pulley  
  8.Which simple machines are found on a hammer?  
  a.   plane and lever  
  b.   screw and pulley  
  c.   wedge and plane  
  d.   lever only  
  9.Name the four simple machines.  
  a.   plane, lever, screw, and wedge  
  b.   wedge, lever, pulley, and wheel  
  c.   screw, lever, wedge, and plane  
  d.   inclined plane, lever, wheel and axle, and pulley  
  10.Power is measured by which units?  
  a.   newton-meters  
  b.   newtons  
  c.   joules  
  d.   watts  
  11.Using several pulleys together is known as a __________.  
  a.   pulley system  
  b.   wheel and axle  
  c.   machine system  
  d.   pulley group  
  12.The unit for work is a joule, which is equal to __________.  
  a.   N + m  
  b.   N x m  
  c.   N - m  
  d.   N/m  
  13.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   more than 100 percent  
  c.   impossible to calculate  
  d.   less than 100 percent  
  14.How do input force and output force relate to each other?  
  a.   The input is always less than the output.  
  b.   They are the same.  
  c.   They are always different.  
  d.   They are unrelated.  
  15.What is transferred when work is done?  
  a.   mass  
  b.   velocity  
  c.   matter  
  d.   energy  
  16.A drill bit is an example of which type of machine?  
  a.   pulley  
  b.   wheel and axle  
  c.   lever  
  d.   screw  
  17.On what point does a lever pivot?  
  a.   the middle  
  b.   the arm  
  c.   the end  
  d.   the fulcrum  
  18.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 stays the same.  
  d.   It increases.  
  19.What is the scientific formula for work?  
  a.   W = F + d  
  b.   W = F/d  
  c.   W = F - d  
  d.   W = F x d  
  20.A chisel is an example of which machine?  
  a.   wedge  
  b.   pulley  
  c.   lever  
  d.   wheel and axle  

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