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SEDL
Southwest Educational Development Laboratory: Simple Machines [Pdf]
This large PDF file contains seven lessons on simple machines. Includes illustrations. Requires Adobe Reader.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Simple Machines (Grades 1 To12)
In this lesson plan learners start by trying to open a paint can with their bare hands. Eventually, they will use a lever to open it. Various activities are used to enforce different simple machines.