Mechanics
Build a Gear Train
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Fit the gears together and turn one: every gear that touches it turns too, each in the opposite direction to its neighbor.
A big gear turning a small one makes the small one spin faster; a small gear turning a big one makes it turn slower but with more force. Bicycles, clocks, and cars all rely on this.
Make a chain of gears. If you turn the first one clockwise, which way does the last one turn?
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