Purpose
Drawing a free body diagram can help determine the unknown forces on, moments applied to, and equations of motion of, the body and thus help to analyse a problem in statics or dynamics. In analysis of structures, free body diagrams for a component of a structure or, part thereof, are used in determining shear forces and bending moments.
Read more about this topic: Free Body Diagram
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“Rule of criticism: only attend to the shape, and the purpose will manifest itself.”
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