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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 J  
  b.   50,000 J  
  c.   5,000 J  
  d.   500 J  
  2.What is the mechanical advantage if 50 J are put in and 200 J are produced?  
  a.   200  
  b.   4  
  c.   50  
  d.   1000  
  3.The efficiency of all machines is __________.  
  a.   impossible to calculate  
  b.   more than 100 percent  
  c.   exactly 100 percent  
  d.   less than 100 percent  
  4.A chisel is an example of which machine?  
  a.   wedge  
  b.   wheel and axle  
  c.   pulley  
  d.   lever  
  5.How do input force and output force relate to each other?  
  a.   They are the same.  
  b.   The input is always less than the output.  
  c.   They are unrelated.  
  d.   They are always different.  
  6.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 goes to zero.  
  d.   It increases.  
  7.Which simple machines are found on a hammer?  
  a.   plane and lever  
  b.   screw and pulley  
  c.   lever only  
  d.   wedge and plane  
  8.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  
  9.When you climb stairs and then walk down a hallway, in which direction is the work done?  
  a.   upward  
  b.   in the opposite direction that you walk  
  c.   along the hallway  
  d.   downward  
  10.What is the scientific formula for work?  
  a.   W = F - d  
  b.   W = F + d  
  c.   W = F/d  
  d.   W = F x d  
  11.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 decreases.  
  d.   It increases.  
  12.Mechanical advantage is equal to __________.  
  a.   output force times input force  
  b.   input force times output force  
  c.   output force divided by input force  
  d.   input force divided by output force  
  13.Power is measured by which units?  
  a.   newtons  
  b.   joules  
  c.   newton-meters  
  d.   watts  
  14.The unit for work is a joule, which is equal to __________.  
  a.   N/m  
  b.   N x m  
  c.   N + m  
  d.   N - m  
  15.A ramp in a building is an example of which machine?  
  a.   wedge  
  b.   lever  
  c.   inclined plane  
  d.   pulley  
  16.Using several pulleys together is known as a __________.  
  a.   pulley group  
  b.   wheel and axle  
  c.   machine system  
  d.   pulley system  
  17.What does a screw consist of?  
  a.   a wedge wrapped around a pipe  
  b.   a wheel and axle in a vertical position  
  c.   a lever wrapped around a pole  
  d.   an inclined plane wrapped around a cylinder  
  18.Which of the following do you think a wheel and axle is most closely related to?  
  a.   lever  
  b.   inclined plane  
  c.   wedge  
  d.   pulley  
  19.Name the four simple machines.  
  a.   plane, lever, screw, and wedge  
  b.   screw, lever, wedge, and plane  
  c.   inclined plane, lever, wheel and axle, and pulley  
  d.   wedge, lever, pulley, and wheel  
  20.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.   moving the blocks across the desert  
  c.   lifting the blocks  
  d.   No work was done in a scientific sense.  

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