Lesson: 20L ESR Gearing Up & Gearing Down
This lesson introduces students to gear trains and has them build a hand-crank gear train to demonstrate the idea of gearing up and gearing down. In subsequent lessons, we will add gears to Riley.
1 ) Watch this video to learn about Gear Trains:
2) Now build this crank & wheel assembly with gears:
Crank & Wheel Gear Train Image
3) Turn the crank and notice the direction and speed the wheel turns
4) Swap the crank and wheel - what changes?
5) Try using the 24 tooth gear (shown to the side in the above image) instead of the small gear - what changes?
6) Do you see a pattern of how fast the wheel turns based on the location of the larger and smaller gears?
7) Answer these questions:
When the crank is on the larger gear, does the wheel turn faster or slower?
Is this gearing up, or down?
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