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Week3_1

# Week3_1 - ENGR210 Fall 2011 Problem solving processes for a...

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ENGR210, Fall 2011 1 Problem solving processes for a system in static equilibrium 1. Draw FBDs 1-1. Identify a coordinate system 1-2. Draw outlines of the system Write known quantities (magnitude, direction, etc.) Write unknowns (force, length, angle, etc.) 2. Write static equilibrium equations For a 2D particle system, ܨݔ ൌ 0, ܨݕ ൌ 0 (2 eqns) For a 3D particle system, ܨݔ ൌ 0, ܨݕ ൌ 0, ܨݖ ൌ 0 (3 eqns) 3. Identify additional equations, if necessary (e.g., spring force (Fs=kl), the Pythagorean theorem, etc.) * The number of unknowns you write in your FBDs has to be the same as the number of equations in 2 and 3 to solve for the unknowns.

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ENGR210, Fall 2011 2 (OLD)
ENGR210, Fall 2011 3 Comments: The solution above started with the node (particle) A, and therefore, could immediately solve for T AB and T AC (i.e., two equilibrium equations and two unknowns). If you start with the node B, you will not be able to solve for the three unknown tension forces (T AB ,T BC and T BE ) because there are only two equilibrium equations available at B. However, by

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