Hi all, im a little confused with a supposedly simple statics concept. The topic was on vector forces and the polygon of forces with respect to a static mechanics problem. The text i was reading was a little confusing: The text also shows a diagram both spacial and a 2D polygon of vectors diagram. The text offers no explanation of why they must betaken in a specific order, or what that order is. For example, the spacial diagram (which shows 4 tie-bars coincident at a point) has the forces numbered (1-4) in a clockwise direction about the common point. Then the polygon of forces 2D diagram shows the forces arranged (1-4) in a counter-clockwise direction showing how they form a polygon end-to-end. Yet no justification or explanation of why the forces are drawn this way (other than it works, which isnt good enough for me :P). Can anyone offer an explanation why the stated order works over any other possible combination of arrangements of forces?