==== Work and Energy ====
This tool allows you to raise a mass on a hinged plank, increasing its gravitational energy.
Increasing an object's energy requires work.  In each of the following tasks, the work can be completed with a larger or smaller force.  What is the tradeoff?

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{{:simplemachinedemonstrator2.png?400|}}
  * Lift the mass by pulling up on the zip-ties as shown.
  * Compare the effort required to lift the mass using each zip-tie.
  * Which makes it easier to lift the mass? Which requires more distance?

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{{:simplemachinedemonstrator1.png?400|}}
  * Attach a string from the wind-up reel to a hook on the plank as shown.
  * Compare the effort required to grip each wheel and spin it.
  * Which makes it easier to lift the mass? Which requires more distance?

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{{:simplemachinedemonstrator3.png?400|}}
  * Start two bolts (#10-32 and #10-24) in the t-nuts as shown.
  * Compare the effort required to lift a mass using each bolt.
  * Which makes it easier to lift the mass?  Which requires more turns?

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{{:simplemachinedemonstrator4.png?400|}}
  * Attach a string to a hook on the plank and over the hook on the vertical piece as shown.
  * Thread the string under and over two more hooks and pull the string.
  * Compare the effort required to pull the string when it is looks like a 'V' and when it looks like an 'N'.
  * Which makes it easier to lift the mass?  Which requires more distance?

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==== How would you summarize your findings? ====
  * Consider starting your summary this way: "There are two ways to increase an object's gravitational energy. One way requires ..."