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# Lecture+10 - 440:221 Intro to Engineering Mechanics Statics...

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440:221 Intro to Engineering Mechanics: Statics 1 Fall 2011 Based on Textbook Material: Engineering Mechanics Statics, 12 th Edition, R.C. Hibbeler, Pearson 2010. Alberto Cuitino, Po Ting Lin Instructors Arturo Villegas Assistants

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440:221 Lectures School of Engineering, Fall 2011 Topics to be covered • What is a moment of a COUPLE ? • What is it useful for? • How do we compute a such moment? 2
440:221 Lectures School of Engineering, Fall 2011 Moment of a COUPLE 3 A torque or moment of 12 N · m is required to rotate the wheel. Why does one of the two grips of the wheel above require less force to rotate the wheel?

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440:221 Lectures School of Engineering, Fall 2011 Would older vehicles without power steering have larger or smaller steering wheels? When you grip a vehicle’s steering wheel with both hands, a couple moment is applied to the wheel. Moment a COUPLE
440:221 Lectures School of Engineering, Fall 2011 1. In statics, a couple is defined as __________ separated by a perpendicular distance. A) two forces in the same direction B) two forces of equal magnitude C) two forces of equal magnitude acting in the same direction D) two forces of equal magnitude acting in opposite directions 2. The moment of a couple is called a _________ vector. A) Free B) Spin C) Romantic D) Sliding Preliminary Questions … D) two forces of equal magnitude acting in opposite directions D) two forces of equal magnitude acting in opposite directions A) Free A) Free

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440:221 Lectures School of Engineering, Fall 2011 The moment of a couple is defined as M O = F d (using a scalar analysis) or as M O = r × F (using a vector analysis).
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Lecture+10 - 440:221 Intro to Engineering Mechanics Statics...

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