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The building of balsa-wood bridges is very often used as an educational technology. It may be accompanied by a larger project involving varying areas of study. Typically classes which would include a balsa wood bridge cover the subject areas of physics, engineering, static equilibrium, or building trades, although it may be done independently of any of these subjects. Building a balsa wood bridge can be done after completing a section or unit covering a related topic or the process of design and building can be used to guide students to a better understanding of the desired subject area. ==Requirements== Although there is great variety between different balsa wood bridge projects, students are in general trying to build a bridge that can withstand the greatest weight before it fails. Other restrictions are often applied, but these vary widely from one contest to another. Sample requirements include: *restricting the maximum mass of the bridge *requiring a minimum span *requiring a minimum height of the roadway *restricting the physical dimensions of the bridge *restricting the size of individual pieces of balsa wood *limiting the amount of glue or balsa wood that can be used *requiring a driveable roadway that allows passage of a vehicle of specified size *restricting the way pieces are placed on the bridge (for example no parallel joining pieces) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Balsa wood bridge」の詳細全文を読む スポンサード リンク
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