KINE 2050 Lecture Notes - Lecture 23: Gastrocnemius Muscle
20 Apr 2015
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Lecture 23: static equilibrium: whole body motion: equilibrium, a state characterized by balances of forces and torque, three conditions must be met for static equilibrium: Sum of all torques must be zero: that means, acceleration in equilibrium = 0, remember, when you are drawing fbd, draw the reference frame, note: for moment addition, if force is horizontal, moment arm is vertical, note: for moment addition, if force is vertical, moment arm is horizontal, note: all these forces, are external force contacts. How much muscle force is required to hold the joint in position: system definition, to determine forces acting at the elbow, we must separate forearm from rest of upper limb, in order to make the muscle and joint forces external to the system of interest, the line defining the system must pass through the joint of interest, here, we have cut through the elbow (the joint of interest.
