D. Resistance torque at 90°: d 30° 90° P60 60° D1. Draw and label the moment arm. 90° ! Weight = 50 N D2. Calculate the moment arm (write the equation and show all the steps). D3. Calculate the resistance torque (write the equation and show all the steps). FORMULAS TO USE AND INFO SHEET TO LOOK AT: Torque = dx F = d*sine x F * Torque direction determined using right hand rule * Resistance Torque (Nm) = Resistance Force (weight or external force) x Resistance Moment Arm * Resistance Force (F): The force acting against the movement, such as the weight of an object being lifted or the force of gravity on a body part. Resistance Moment Arm (d): The perpendicular distance between the line of action of the resistance force and the joint's axis of rotation. This is also referred to as the lever arm. Proximal segment Examples to practice determining Moment arm and Torque Determine the torque and Extend force's line of action Muscular Force di Joint CCW Torque (+ve) Distal segment * MOMENT ARM EXAMPLE: moment for the figure below Torque in CW direction D d * Σtorque(shoulder)= (-torque[upper arm wt]) + (-torque [forearm wt]) Shoulder joint axis Upper arm COM Location Forearm COM Location Weight of Upper arm Weight of Forearm

A patient rehabilitating a knee injury performs knee extension exercises while wearing a 50 N weight boot. Calculate the amount of resistive torque at the knee by the weight boot for each of the four positions shown, given a distance of 0.5 m from the knee joint center to the center of mass of the weight boot. Show all the steps and provide units in the answers. Provide answer to 2 decimal places unless stated otherwise.) Photo D is Resistance torque at 90°. Answer parts D1-D3. D1) Draw and label the moment arm. D2) Calculate the moment arm (write the equation and show all the steps). D3) Calculate the resistance torque (write the equation and show all the steps). Please USE formula/ info sheet provided.