During Spring Break 2007, I went on the California College Tour and we visited the Golden Gate Bridge in San Fransisco. Apparently, the weather forecast was a bit off (they said it would be unusually sunny and warm). The Golden Gate Bridge is a famous example of a suspension bridge, using cables and pillars to support pedestrians (like me) and vehicles. To balance out the force of gravity on the bridge, suspension bridges rely on the tension in the cables and the compression of the pillars. The cables will eventually form a parabola shape. The net force of the system is 0, since the weight of the bridge cancels with the tension of the cables and the compression of the pillars.