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Wacky Machines: A unit on simple machines gets a new twist with old junk

The Science Teacher—May 2002

The next community yard sale might be a repository of old, quirky items that are just the things to get students thinking about simple machines. By introducing some "wacky machines" at lab stations as mystery objects, teachers can watch students' minds whirl into action. In this activity students must determine the type of machine, sketch the machine, and determine its function.
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