Count the turns: odometer cart
Inventors (Intermediate), mission I3 Gear Superpowers, lesson 2 of 6.
Hook
How does a car know how far it has driven?
Fair test
Push the cart 1 m. Read the dial. Predict the reading for 3 m, then test.
Bonus challenge
Measure the length of the classroom using only your cart.
The build
- 🔢 Odometer Cart: Five turns of the wheels make the flag go round just once — a cart that counts! (level 1 of 5, about 15 minutes, 9 steps)