Press the space bar to advance the gears. There are three scenarios - chosen by the coloured numbers. Scenario 1 has a smaller driver gear and larger driven gear, Scenario 2 has a larger driver gear and smaller driven gear, and Scenario 3 shows compound gears, with the small red driven gear turning four times as fast as the large black driver gear. Clicking on GR will show the formula for calculating Gear ratio, as specified in the UK GCSE Physics exam syllabus.
