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Unformatted text preview: The moment equation may also be written as: = = M & F o Where the couple C is the sum of all applied couples on the body = + C ) F x r ( ME221 Lecture 12 10 Equilibrium Equations If there are more than 6 unknown forces or couples, the problem is statically indeterminate. ME221 Lecture 12 11 Solving Equilibrium Equations Draw a proper free body diagram Write each force and couple as a vector Draw position vectors from the origin to the line of action of each force Write the vector equations of static equilibrium 6 equations, 6 unknowns ME221 Lecture 12 12 Statically Indeterminate Reactions Underconstrained system Cannot maintain equilibrium Overconstrained systems More unknown forces than equations ME221 Lecture 12 13 Example ME221 Lecture 12 14 Quiz #5...
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 Summer '08
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 Statics

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