You can only stack coins in the center of the roadway, not on top of the blocks. Try folding the paper in different ways to construct the strongest roadway. Discuss your results and determine which structure was the strongest and why. What's Going On Folding the paper as if to make a paper fan makes a corrugated roadway. The folds form a series of triangles.
Triangles form the strongest structures.
A structure is anything that supports its own weight against gravity, plus the weight of another object. Compression is a push down on the structure that must be channeled to the ground. Tension is a pull that stretches the structure. Triangles support both of these forces. Compression pushes down equally on two sides of the triangle, causing the base to be pulled equally in two directions, which creates tension.