The students have or will learn that a gear is a toothed wheel and that gears work when they are meshed with something else (like a chain or another gear). We also talk about the terms drive, driven, gearing up, gearing down and idler gear. My hope is that the students can use this knowledge for a better understanding of simple machines and when building with the NXT kits in 5th grade.
Continuing to develop the whole child...
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