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Greatest Lever Arm: Calculating Force at Elbow Joint
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[QUOTE="Basic_Physics, post: 4422480, member: 443903"] The question should actually state explicitly for which force the lever arm is required. There are several forces in this diagram, but I am getting the impression its wants you to get the lever arm of the force of the weight held in the hand. The weight [I]F[/I] acts downwards along the pink line in the first diagram and its lever arm is the orange [I]L[/I]. If the lever arm of the force that the muscle is exerting on the forearm were required it would be the much shorter[I] L[/I] in the second diagram. [/QUOTE]
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Greatest Lever Arm: Calculating Force at Elbow Joint
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