the floor AB through a pin joint). In cases like this you have a choice of (a) treating the two parts together as a single system; or (b) considering the strut and floor as two separate systems. As an exercise, we will draw free body diagrams for bothhere. A free body diagram for the balcony and strut together is shown on the right. Note again the convention used to denote the reactions: the first label denotes the location of the force, the second denotes the direction. Both A and C are pin joints, and therefore exert both horizontal and vertical forces. The picture shows free body diagrams for both components. Note the convention we’ve introduced to deal with the reaction force acting at B – it’s important to use a systematic way to deal with forces exerted by one component in a system on another, or you can get hopelessly confused. The recommended procedure is 1.Label the components with numbers – here the balcony is (1) and the strut is (2) 2.
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