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View Full Document. Two Forcesâ resultant can be transferred to âOâ along with the moment caused by these forces at âOâ. But this force couple system cannot be replaced by single force at distance âdâ as the force has to be at âOâ as mentioned in problem. This preview has intentionally blurred sections.
The force arm is the radius of the pulley-that is, the distance from the fulcrum (axle) to the side of the rope on which we pull. The load arm is also the radius of the pulley-the distance from the fulcrum (axle) to the load-carrying side of the rope.