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Bridges can be as simple as a log across a stream or as huge and complicated as the Golden Gate Bridge in San Francisco. Bridges have been made for thousands of years, and over the years, bridges have become longer, more durable, can support more weight, and last longer. This comes from trial and error. When a bridge falls down, the cause of the collapse must be discovered, so that it can be prevented in the future. To figure out why bridges break, there must be an understanding of the forces acting on bridges. This site is an introduction to those forces. To understand these forces, there is information on bridge terms, the types of bridges, and bridge materials. Explore this site and figure out how these structures handle different forces.