phy2048-ch12 - Chapter 12 Equilibrium and Elasticity I...

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1 Chapter 12 – Equilibrium and Elasticity I. Equilibrium - Definition - Requirements - Static equilibrium II. Center of gravity III. Elasticity - Tension and compression - Shearing - Hydraulic stress I. Equilibrium - Definition: 0 , 0 = = L P arrowrightnosp arrowrightnosp Example: block resting on a table, hockey puck sliding across a frictionless surface with constant velocity, the rotating blades of a ceiling fan, the wheel of a bike traveling across a straight path at constant speed. An object is in equilibrium if: - The linear momentum of its center of mass is constant. - Its angular momentum about its center of mass is constant. - Static equilibrium: Objects that are not moving either in TRANSLATION or ROTATION Example: block resting on a table .
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2 Stable static equilibrium: If a body returns to a state of static equilibrium after having been displaced from it by a force barb2right marble at the bottom of a spherical bowl. Unstable static equilibrium: A small force can displace the body and end the equilibrium.
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