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This Concept Map, created with IHMC CmapTools, has information related to: Sean bridges, Special Thanks to http://www.zimsweb.com/balsa/information/info.htm, Compression which is the force that acts to shorten what it is acting on, Bridges includes Span, Equation to help solve how much it can hold which is (Load*4.45)/Mass of structure=Efficiency, Span which is the distance between two bridge supports, Bridges includes Tension, (Load*4.45)/Mass of structure=Efficiency Simplification Efficiency*: How long the bridge stays stable, (Load*4.45)/Mass of structure=Efficiency Simplification Mass of structure: Mass of bridge, Bridges includes Compression, (Load*4.45)/Mass of structure=Efficiency Simplification Load: Amount of what it is holding at that moment, Special Thanks to http://science.howstuffworks.com/bridge1.htm, Tension which is the force that expands of lenghthens what it is acting on, Bridges have an Equation to help solve how much it can hold