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Free body diagram
In physics a free body diagram (force diagram,〔(【引用サイトリンク】 Force Diagrams (Free-body Diagrams) )〕 or FBD) is a graphical illustration used to visualize the applied forces, movements, and resulting reactions on a body in a steady state condition (no acceleration of the system). They depict a body or connected bodies with all of the applied forces and moments, as well as reactions, that act on that/those body(ies). The body may consist of multiple internal members, for example, a truss, or be a compact body such as a beam. A series of free bodies and other diagrams may be necessary to solve complex problems.
== Purpose ==
Free body diagrams are used to visualize the forces and moments applied to a body and calculate the resulting reactions, in many types of mechanics problems. In structural analysis free body diagrams are used both to determine the loading of individual structural components as well as calculating internal forces within the structure.
In the educational environment, learning to draw a free body diagram is an important step in understanding certain topics in physics, such as statics, dynamics and other forms of classical mechanics. One professor at Cornell University earned the nickname "Free-Body Perkins" because of his passion for teaching the importance of using free body diagrams to solve mechanics problems. He went so far as to stop random students in the hall, saying, “You! Come in my office! Draw a free body diagram!”〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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