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Work and Simple Machines

Practice Test
  1.Mechanical advantage is equal to __________.  
  a.   input force divided by output force  
  b.   output force times input force  
  c.   input force times output force  
  d.   output force divided by input force  
  2.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N/m  
  c.   N - m  
  d.   N + m  
  3.Which is an example of work being done in a scientific sense?  
  a.   doing homework  
  b.   carrying a box  
  c.   lifting a box  
  d.   pushing against a stationary box  
  4.Which simple machines are found on a hammer?  
  a.   wedge and plane  
  b.   screw and pulley  
  c.   plane and lever  
  d.   lever only  
  5.How do input force and output force relate to each other?  
  a.   They are the same.  
  b.   They are always different.  
  c.   The input is always less than the output.  
  d.   They are unrelated.  
  6.What is transferred when work is done?  
  a.   mass  
  b.   matter  
  c.   energy  
  d.   velocity  
  7.A ramp in a building is an example of which machine?  
  a.   lever  
  b.   pulley  
  c.   inclined plane  
  d.   wedge  
  8.The efficiency of all machines is __________.  
  a.   less than 100 percent  
  b.   impossible to calculate  
  c.   exactly 100 percent  
  d.   more than 100 percent  
  9.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stays the same.  
  b.   It increases.  
  c.   It decreases.  
  d.   It stops.  
  10.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 increases.  
  d.   It goes to zero.  
  11.A chisel is an example of which machine?  
  a.   wheel and axle  
  b.   lever  
  c.   pulley  
  d.   wedge  
  12.A 5,000 N block was lifted 10 m. How much work was done?  
  a.   500 J  
  b.   50 J  
  c.   50,000 J  
  d.   5,000 J  
  13.What is a sign that work is being done?  
  a.   mass  
  b.   density  
  c.   motion  
  d.   matter  
  14.What does a screw consist of?  
  a.   a lever wrapped around a pole  
  b.   an inclined plane wrapped around a cylinder  
  c.   a wheel and axle in a vertical position  
  d.   a wedge wrapped around a pipe  
  15.Using an inclined plane allows you to apply __________.  
  a.   a lesser force  
  b.   no force  
  c.   the same force  
  d.   a greater force  
  16.What is the scientific formula for work?  
  a.   W = F - d  
  b.   W = F + d  
  c.   W = F/d  
  d.   W = F x d  
  17.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   pulley  
  c.   inclined plane  
  d.   wedge  
  18.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   pulley group  
  c.   pulley system  
  d.   wheel and axle  
  19.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   downward  
  b.   along the hallway  
  c.   upward  
  d.   in the opposite direction that you walk  
  20.A drill bit is an example of which type of machine?  
  a.   screw  
  b.   wheel and axle  
  c.   pulley  
  d.   lever  

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