A beam bridge can hold up a great weight albeit for very short distances while suspension bridges can tackle tension and torque (turning effect of a force) effectively over a long distance. The various designs of bridges can be tried to see which structure gives maximum support. In addition to that, natural phenomena like wind currents, rainfall should also be combated. Another force to handle is compression, which tries to exert a push on the bridge and shorten it in the process. It should also have the capacity to withstand tension, that is, the force which tends to pull apart or elongate the bridge. Organizers of most bridge-building contests rank these bridges, highly. The strongest toothpick bridges have very big ratios of their own weight to the maximum weight they can handle. Triangles are known to form very stable structures. You can make a truss out of toothpicks and use as a connector to the two sides.Now join the two sides together by multiple toothpicks to hold the two sides of the bridge.You are done with the other side of the bridge Pull out the framework from the paper and make it stand upright.Now create another similar toothpick framework of the bridge on the wax paper.You can also insert the toothpicks into marshmallows which can secure the junctions of your bridge. Put the toothpicks over the pencil marks on the wax paper and glue them together.
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