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Lecture 1 - Statics Ch 11:1-5 Announcements Discussion...

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April 1, 2008 Physics 40B Lecture 1 1 Statics Ch. 11:1-5 Announcements Discussion sections start Wednesday No labs this week Syllabus and homework assignments on iLearn Use Mastering Physics website for submission Two Midterm Examd Individual lectures posted on iLearn before class Material for Today Rigid bodies in stable static equilibrium Center of Gravity Stress & Strain: tensile, compression, bulk, shear
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April 1, 2008 Physics 40B Lecture 1 2 Conditions for Static Equilibrium Translational Equilibrium r F Net = d r P dt r P = constant = 0 ( no net external forces ) " F x # = F y # = F z # = 0 $ Net = d r L dt = 0 r L = constant = 0 ( no net external torques ) " $ x # = $ y # = $ z # = 0 r $ = r r x r F Rotational Equilibrium Center of Gravity The force of gravity and the torque due to gravity can be considered to be acting at a single point of the body--I.e., the Center-of-Gravity (cg) . If “g” is constant over the volume of the object then the Center-of-Gravity is the same as the Center-of-Mass point.
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