Learn by changing one thing

Practice predicting, experimenting, and explaining in two very different systems.

1. 01

   Start a traffic ripple

   Brake one car. Watch the following drivers and compare with the road without braking.

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2. 02

   Look at one driver

   Inspect the selected car’s speed and gap. Explain how its response affects the next driver.

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3. 03

   Change a gear ratio

   Compare equal-size gears with a larger output gear. Predict the speed before you turn it.

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4. 04

   Name the trade-off

   Connect the change in output speed to ideal torque. Read which effects this model leaves out.

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Take these steps at your own pace. Your place is not saved as account progress or scored.