05Portland.ppt

# 05Portland.ppt - Teaching Students Work and Virtual Work...

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Teaching Students Work and Virtual Work Method in Statics: A Guiding Strategy with Illustrative Examples Ing-Chang Jong University of Arkansas Session 1168: Improving Mechanics of Materials 7:00 – 8:15 a.m., Monday, June 13, 2005 Oregon Convention Center F149 Portland, Oregon Proceedings of the 2005 ASEE Annual Conference & Exposition Mechanics Division 1

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Work Energy? What is work? Work is energy in transition to a system due to force or moment acting on the system through a displacement. ( Note: Heat is energy in transition to a system due to temperature difference between the system and its surroundings.) Work differs from energy in that work is not a property possessed by a system, while energy (e.g., kinetic energy or potential energy) is. Work is a boundary phenomenon. 12 UF q =⋅= Fq & θ = () UM Mechanics Division 2
Displacement center, rigid-body virtual displace- ment, & compatible virtual displacement 2 () 2 L BB δθ ′′ ′ ≈ A body undergoes rigid-body virtual displacement from AB to AB ″. The displacement center is at A . A body undergoes virtual displacement from position AB to position Α′ B . The displacement center is at C .

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## This note was uploaded on 11/24/2011 for the course MEEG 2003 taught by Professor Ing-chang,j during the Fall '08 term at Arkansas.

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05Portland.ppt - Teaching Students Work and Virtual Work...

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