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Work and Simple Machines

Practice Test
  1.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   more than 100 percent  
  c.   less than 100 percent  
  d.   impossible to calculate  
  2.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   lever  
  c.   pulley  
  d.   wheel and axle  
  3.Which is an example of work being done in a scientific sense?  
  a.   doing homework  
  b.   pushing against a stationary box  
  c.   lifting a box  
  d.   carrying a box  
  4.Power is measured by which units?  
  a.   watts  
  b.   newtons  
  c.   joules  
  d.   newton-meters  
  5.What is transferred when work is done?  
  a.   velocity  
  b.   mass  
  c.   energy  
  d.   matter  
  6.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   4  
  c.   1000  
  d.   50  
  7.What is a sign that work is being done?  
  a.   density  
  b.   matter  
  c.   motion  
  d.   mass  
  8.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 increases.  
  d.   It decreases.  
  9.The unit for work is a joule, which is equal to __________.  
  a.   N/m  
  b.   N + m  
  c.   N x m  
  d.   N - m  
  10.A chisel is an example of which machine?  
  a.   wedge  
  b.   wheel and axle  
  c.   lever  
  d.   pulley  
  11.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   5,000 J  
  b.   500 J  
  c.   50 J  
  d.   50,000 J  
  12.What is the scientific formula for work?  
  a.   W = F - d  
  b.   W = F/d  
  c.   W = F + d  
  d.   W = F x d  
  13.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   a wedge wrapped around a pipe  
  c.   a lever wrapped around a pole  
  d.   an inclined plane wrapped around a cylinder  
  14.A ramp in a building is an example of which machine?  
  a.   pulley  
  b.   wedge  
  c.   inclined plane  
  d.   lever  
  15.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   input force divided by output force  
  c.   input force times output force  
  d.   output force divided by input force  
  16.Which of the following do you think a wheel and axle is most closely related to?  
  a.   pulley  
  b.   wedge  
  c.   lever  
  d.   inclined plane  
  17.On what point does a lever pivot?  
  a.   the fulcrum  
  b.   the middle  
  c.   the end  
  d.   the arm  
  18.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 unrelated.  
  d.   They are the same.  
  19.Using an inclined plane allows you to apply __________.  
  a.   the same force  
  b.   a lesser force  
  c.   no force  
  d.   a greater force  
  20.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   wheel and axle  
  c.   machine system  
  d.   pulley system  

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