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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 15° Deltoid K 17 cm Arm weight = 40 N 38 cm

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 15° Deltoid K 17 cm Arm weight = 40 N 38 cm

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A student is holding his arm stationary in a 90° shoulder abduction position (shown below). The deltoid muscle attaches to the humerus at a 15-degree angle 17 cm from the shoulder joint center. The weight of the arm is 40 N and its acts 38 cm from the shoulder joint. Show all the steps and provide units in the answers. Provide answer to 2 decimal places unless stated otherwise.) a. Draw, label, and calculate the moment arm of the deltoid muscle. b) Draw, label, and calculate the moment arm of the arm weight. c) How much force is required of the deltoid muscle to stabilize the shoulder joint in the shown position? (write the equation and show all the steps). Answer parts a-c. Please USE formula/ info sheet provided. 

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
Transcribed Image Text: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
15° Deltoid K 17 cm Arm weight = 40 N 38 cm
Transcribed Image Text:15° Deltoid K 17 cm Arm weight = 40 N 38 cm
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