Lecture 11 sect 3.6

# Lecture 11 sect 3.6 - ME221 Statics LECTURE 11 Sections 3.6...

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ME221 Lecture 11 1 ME221 Statics LECTURE # 11 Sections 3.6 – 3.7

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ME221 Lecture 11 2 Homework #4 Chapter 3 problems: 1, 4, 8, 11, 17, 25, 26, 28, 35 & 40 To be solved using hand calculations May check work using MathCAD, etc. Due Friday, September 26 Quiz #3 Today
ME221 Lecture 11 3 Moment of a Force about an Axis x y z O F B n ^ A r AB =r B/A | M n | =M A ·n ^ =n·(r B/A x F ) ^ Same as the projection of M A along n | M n |= n x n y n z r B/Ax r B/A y r B/Az F x F y F z

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ME221 Lecture 11 4 x y z O F B n ^ A r AB =r B/A M M n Mp Resolve the vector M A into two vectors one parallel and one perpendicular to n . M n =|M n |n ^ M p = M A - M n =n x [ (r B/A x F) x n] ^ ^
ME221 Lecture 11 5 Moment of a Couple x y z O F 2 B r F 1 r AB =r r A Let F 1 = -F 2 d M o =r A x F 2 + r B x F 1 =(r B - r A ) x F 1 =r AB x F 1 = C The Moment of two equal and opposite forces is called

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## This note was uploaded on 07/25/2008 for the course ME 221 taught by Professor Buch during the Summer '08 term at Michigan State University.

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Lecture 11 sect 3.6 - ME221 Statics LECTURE 11 Sections 3.6...

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