The truss bridge
Inventors (Intermediate), mission I6 Bridges & Structures, lesson 1 of 6.
Hook
Look at any big bridge: triangles everywhere! Why triangles?
Fair test
Span 30 cm between books. Add coins to a hanging cup until the deck sags 1 cm.
Bonus challenge
Drive the tiny roller across it. Does the bridge flex?
The build
Truss Bridge: A 30 cm bridge made of triangles (a Warren truss) spanning two stacks of books. Hang a cup of coins in the middle.