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Chapter 12 Notes

# Chapter 12 Notes - Chapter 12 Notes Static Equilibrium o...

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Chapter 12 Notes - Static Equilibrium o Equilibrium implies the object is at rest ( static ) or its center of mass moves with a constant velocity ( dynamic ) o Focus on Static Equilibrium Static equilibrium is a common situation in engineering, resistance training, etc. o Static Equilibrium II 1 st Condition of Static Equilibrium No Net Force o = ΣF 0 Components (2-Dimensions) o Σ F x = 0 o Σ F y = 0 o Static Equilibrium III Στ 0 Object will rotate ! o Not static ! o Static Equilibrium IV 2 nd Condition of Static Equilibrium No Net Torques o = Στ 0 If torque is zero around any axis, it is zero around all axes for static equilibrium Static Equilibrium = vCM 0 ω = 0 - Torque and Equilibrium II o If the object is in equilibrium, it does not matter where you put the axis of rotation for calculating the net torque The location of the axis of rotation is completely arbitrary ( but you must specify one ) Once you have chosen an axis, you can’t change in mid-problem

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