Kinesiology 2241A/B Lecture Notes - Lecture 11: Proprioception, Anatomical Terms Of Motion, Dynamic Equilibrium
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4 Jan 2021
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In physics, equilibrium means all forces and torques add to zero. Static equilibrium no acceleration (isometric position) Dynamic equilibrium there is acceleration (i. e. sprint start) Inertial forces act to oppose any accelerations of the center of mass. These are the forces that you feel" when you are performing a task with acceleration. I. e. in a runner who is turning to his left, he feels the inertial force downward and to his right the opposite of the acceleration of his center of mass. He is in dynamic equilibrium and is accelerating. You are always in equilibrium, and it has nothing to do with stability. Stability is how close the system is to wiping out". Wiping out" means accelerating at a magnitude or direction that you don"t want. Linear stability and rotary stability cannot be separating they are describing how you will wipe out if you lose control. Stability is often related to the size of the base of support.