Tutorial on Free-body diagrams

# Tutorial on Free-body diagrams - FREE-BODY DIAGRAMS Almost...

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DRAWING FREE-BODY DIAGRAMS A free-body diagram is a picture of an object showing the external forces acting on it. An external force is one that is exerted on the object by something that is not itself part of the object. 1. The crucial first step is to decide what is the object you are drawing. Draw the geometrical picture first before you even think about what forces are going to act on it. In this way, you separate the object from the rest of the universe and the forces that you then place on the drawing are those exerted by the rest of the universe on the object. These external forces will typically comprise (i) prescribed external forces such as the weight of the object and forces ‘deliberately’ exerted on it by an external agency — these will typically be the forces shown in the original drawing for the problem — and (ii) reaction forces generated at the supports — i.e. the places where the object is physically connected to the rest of the universe. Notice that you must expect reaction forces at all points where the object that you draw touches or is connected to something that you don’t draw. 2. Reaction forces can be developed whenever local motion of the object is prevented
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Tutorial on Free-body diagrams - FREE-BODY DIAGRAMS Almost...

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