This is quiet simple problem, but I am a bit confused. I have a bridge of S metres length attached to a wall at one end, and a cable at the other. The cable will break under a particular tension force T. If I walk out along it from the wall end, how far can I go before the cable breaks. So first of all, the max tension that I can exert on it must be the max tension T minus the tension the bridge puts on the cable right? The bridge's weight acts from its center, ie. center of gravity. Its weight is mg, but do I need to take into account its distance from the wall to its center of gravity???