Double subscript (Force) notation confusion?

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The discussion centers on the correct notation for force representation, questioning whether it should be Pdc = 22kN instead of Pcd, as the force arrow points towards point C. It clarifies that Pdc indicates the force exerted by D on C, while Pcd represents the force from C to D. A free body diagram (FBD) of cut section 3-3 to D is referenced to support this notation. Additionally, it suggests that one could also use Newton's third law to analyze the forces. The conversation emphasizes the importance of accurate force notation in structural analysis.
influx
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Shouldn't it be Pdc = 22kN rather than Pcd? I mean the 22kN force arrow is pointing towards C? Because Pdc means the P from D to C no?
 
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influx said:
View attachment 81257Pcd is the force of c on d. Pdc is the force of d on c. Free body diagram of cut section 3-3 to D is shown. You can draw FBD of cut section 3-3 to A to get Pdc. Or use Newton 3.
 

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