phy2048-ch11_new - Chapter 11 Equilibrium and Elasticity I....

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Unformatted text preview: Chapter 11 Equilibrium and Elasticity I. Equilibrium- Definition- Requirements- Static equilibrium II. Center of gravity III. Elasticity- Tension and compression- Shearing- Hydraulic stress I. Equilibrium- Definition: , = = L P a a 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 . Stable static equilibrium: If a body returns to a state of static equilibrium after having been displaced from it by a force b 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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This note was uploaded on 07/30/2011 for the course PHY 2049 taught by Professor Saha during the Spring '08 term at University of Central Florida.

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phy2048-ch11_new - Chapter 11 Equilibrium and Elasticity I....

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