My Bridge

The class was given 5 pieces of information:
1) The bridge must weigh less than 100 grams
2) The bridge must span a space of 16 inches
3) The bridge must be at least 3.5 inches wide
4) If the bridge is able to hold 120lbs, you will receive a 90%
5) The bridge can be made only out of balsa wood and adhesive

Based upon these criteria, I have chosen to build a Warren Truss Bridge. If, after I build this bridge, I have enough supplies to build a second or third bridge, I will. My bridge will be approximately 18 inches longs, 4 inches high, and 3.5 inches wide.

Here is an analysis of how the Warren truss distributes forces:

Each number represents a percent of the load applied to the bridge. My bridge will utilize equilateral triangles to spread the force out evenly across the bridge.