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Work and Simple Machines

Practice Test
  1.Which of the following do you think a wheel and axle is most closely related to?  
  a.   wedge  
  b.   lever  
  c.   inclined plane  
  d.   pulley  
  2.What is the scientific formula for work?  
  a.   W = F + d  
  b.   W = F - d  
  c.   W = F/d  
  d.   W = F x d  
  3.Mechanical advantage is equal to __________.  
  a.   input force divided by output force  
  b.   output force divided by input force  
  c.   input force times output force  
  d.   output force times input force  
  4.On what point does a lever pivot?  
  a.   the middle  
  b.   the fulcrum  
  c.   the arm  
  d.   the end  
  5.Which simple machines are found on a hammer?  
  a.   wedge and plane  
  b.   lever only  
  c.   screw and pulley  
  d.   plane and lever  
  6.Power is measured by which units?  
  a.   newtons  
  b.   watts  
  c.   joules  
  d.   newton-meters  
  7.The efficiency of all machines is __________.  
  a.   exactly 100 percent  
  b.   impossible to calculate  
  c.   more than 100 percent  
  d.   less than 100 percent  
  8.Which is an example of work being done in a scientific sense?  
  a.   pushing against a stationary box  
  b.   doing homework  
  c.   carrying a box  
  d.   lifting a box  
  9.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   inclined plane  
  d.   pulley  
  10.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   pulley  
  c.   wheel and axle  
  d.   lever  
  11.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   5,000 J  
  b.   50 J  
  c.   500 J  
  d.   50,000 J  
  12.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 increases.  
  c.   It stays the same.  
  d.   It decreases.  
  13.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.  
  14.What is a sign that work is being done?  
  a.   mass  
  b.   motion  
  c.   density  
  d.   matter  
  15.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   upward  
  b.   downward  
  c.   along the hallway  
  d.   in the opposite direction that you walk  
  16.A chisel is an example of which machine?  
  a.   lever  
  b.   pulley  
  c.   wedge  
  d.   wheel and axle  
  17.What is transferred when work is done?  
  a.   matter  
  b.   mass  
  c.   energy  
  d.   velocity  
  18.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   50  
  b.   1000  
  c.   200  
  d.   4  
  19.The unit for work is a joule, which is equal to __________.  
  a.   N - m  
  b.   N x m  
  c.   N + m  
  d.   N/m  
  20.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   an inclined plane wrapped around a cylinder  
  c.   a wheel and axle in a vertical position  
  d.   a lever wrapped around a pole  

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