Bridge Balance

I found an example of torque just in time for the upcoming test. The bridge is really old and falling apart, but its weight is still being held up by the normal force of the ground on both sides. The weight is focused in the CM (center of mass), which probably isn't in the middle of the bridge since parts of the fence have already fallen off. The weight has to be supported by the ground, because otherwise the it would keep on falling. Besides the forces cancelling each other out, no matter where the fulcrum is, the torque exerted by the forces also have to cancel each other because otherwise the bridge would be rotating instead of standing still. (Torque is equal to forcexdistance from the fulcrum). The balance for the forces and torque exerted are the reason why this bridge stays still.