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In physics a free body diagram (force diagram,[1] or FBD) is a graphical illustration used to visualize the applied forces and moments and resulting, reactions, on a body in 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.