In a follow-on lesson we mod the Gear Racer and replace the motor with a hand crank to allow us to count the revolutions of the motor (effort) to produce one revolution of the wheels (load). Low and behold it was the same as our calculated gear ratios from the earlier teeth counting approach!

Removing the back wheels

Gear Racer with motor replaced by a hand crank

Gear Racer with motor replaced by a hand crank

Now start counting input revolutions and output revolutions in each gear

Then we document what we found out and compare back to our previous gear ratio calculations