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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.   50,000 J  
  b.   5,000 J  
  c.   500 J  
  d.   50 J  
  2.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   along the hallway  
  b.   in the opposite direction that you walk  
  c.   downward  
  d.   upward  
  3.What is a sign that work is being done?  
  a.   mass  
  b.   matter  
  c.   density  
  d.   motion  
  4.What happens to the total amount of work done when you use a machine compared to not using a machine?  
  a.   It increases.  
  b.   It goes to zero.  
  c.   It decreases.  
  d.   It stays the same.  
  5.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  
  6.A drill bit is an example of which type of machine?  
  a.   wheel and axle  
  b.   pulley  
  c.   screw  
  d.   lever  
  7.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   1000  
  b.   4  
  c.   200  
  d.   50  
  8.Name the four simple machines.  
  a.   inclined plane, lever, wheel and axle, and pulley  
  b.   screw, lever, wedge, and plane  
  c.   wedge, lever, pulley, and wheel  
  d.   plane, lever, screw, and wedge  
  9.What is the scientific formula for work?  
  a.   W = F x d  
  b.   W = F + d  
  c.   W = F - d  
  d.   W = F/d  
  10.Which simple machines are found on a hammer?  
  a.   wedge and plane  
  b.   lever only  
  c.   screw and pulley  
  d.   plane and lever  
  11.How do input force and output force relate to each other?  
  a.   They are the same.  
  b.   They are always different.  
  c.   They are unrelated.  
  d.   The input is always less than the output.  
  12.Using several pulleys together is known as a __________.  
  a.   machine system  
  b.   pulley system  
  c.   pulley group  
  d.   wheel and axle  
  13.Power is measured by which units?  
  a.   joules  
  b.   newton-meters  
  c.   newtons  
  d.   watts  
  14.Which of the following do you think a wheel and axle is most closely related to?  
  a.   inclined plane  
  b.   pulley  
  c.   wedge  
  d.   lever  
  15.What happens to the amount of power expended when you are climbing stairs and then climb faster?  
  a.   It stops.  
  b.   It stays the same.  
  c.   It increases.  
  d.   It decreases.  
  16.What is transferred when work is done?  
  a.   matter  
  b.   mass  
  c.   energy  
  d.   velocity  
  17.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   inclined plane  
  c.   pulley  
  d.   lever  
  18.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.   moving the blocks across the desert  
  b.   No work was done in a scientific sense.  
  c.   when lifting the blocks and when moving them across the desert  
  d.   lifting the blocks  
  19.The unit for work is a joule, which is equal to __________.  
  a.   N x m  
  b.   N - m  
  c.   N/m  
  d.   N + m  
  20.What does a screw consist of?  
  a.   a wheel and axle in a vertical position  
  b.   a lever wrapped around a pole  
  c.   an inclined plane wrapped around a cylinder  
  d.   a wedge wrapped around a pipe  

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