Engineering Science 1022A/B/Y Lecture Notes - Lecture 12: Force
1 Jan 2019
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Rigid bodies can be composed of single members, or made up of a number of pin connected multi-force members. If a free-body diagram is drawn of the entire body, then the forces generated at the pin connections are internal forces and not shown on the free-body diagram. Draw a fbd of the entire structure, a portion of the structure, or each of the members of the structure as appropriate, remembering that: Two-force members, regardless of their shape, have equal but opposite collinear forces acting at the ends of the member. Forces common to two members which are in contact act with equal magnitude, but opposite sense on the respective fbds of the members. When a fbd of several connected members of a structure is drawn, the forces at the connections between the members are internal forces and are not shown on the fbd.
