Big wheels, small wheels
Inventors (Intermediate), mission I5 Wheels & Measuring, lesson 3 of 6.
Hook
Do big wheels go farther per turn? How much farther?
Fair test
Measure each wheel’s diameter. Predict distance per turn (about 3 × diameter), then test.
Bonus challenge
Use your data to build a car that goes exactly 50 cm for 10 cranks.
The build
- 🎡 Crank Cruiser: Turn the handle and the car rolls — every turn of your hand spins the wheels three times! (level 2 of 5, about 18 minutes, 9 steps)