Chapter_12 - Objects in static equilibrium dont move. Of...

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Unformatted text preview: Objects in static equilibrium dont move. Of special interest to civil and mechanical engineers and architects. Well also learn about elastic (reversible) deformations . Plastic deformations are irreversible (like play dough) Chapter 12: Static Equilibrium and Elasticity Reading assignment: Chapter 12.1 to 12.4 Homework : QQ1, QQ3, OQ9, AE2, 3, 8, 11, 27, 28, 39, 49 Due date: Friday, April 8 Objects in static equilibrium dont move or rotate. Conditions for static equilibrium Conditions for static equilibrium (For extended objects) 1. The net force acting on the particle must be zero. 2. The net torque about any axis acting on the particle must be zero. 3. The angular and linear speeds must be zero. = F = We restrict ourselves to forces in the x-y plane. Thus: = x F = z = y F Center of gravity Consider an extended object. - The gravitational force mg always acts on the center of gravity !...
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Chapter_12 - Objects in static equilibrium dont move. Of...

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