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Work and Simple Machines

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

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