After we dissected wind-up toys we built gear trains with lego pieces. We learned about drivers, idlers, and followers. We also made observations about gear speed and gear direction. Here is a picture of a gear train example.
Here is the Lego Education Site where you can view gears in action.
Lego Constructopedia
Check out this cool book on gears and simple machines.
The Lego Technic Idea Book:Simple Machines
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