Lecture+09

# Lecture+09 - 440:221 Intro to Engineering Mechanics Statics...

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440:221 Intro to Engineering Mechanics: Statics Instructor: Alberto Cuitino TA: Pam Carabetta and Jingru Zhang Lecture 9 Fall 2009 1 Based on Textbook Material: Engineering Mechanics Statics, 12 th Edition, R.C. Hibbeler, Pearson 2010.

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440:221 Lectures opics to be covered Topics to be covered • What is a moment of a COUPLE ? • What is it useful for? • How do we compute a such moment? School of Engineering, Fall 2009 2
440:221 Lectures oment of a OUPLE Moment of a COUPLE School of Engineering, Fall 2009 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 oment a OUPLE Moment a COUPLE hen you grip a vehicle’s steering wheel with both hands a couple ould older vehicles without power steering have larger or When you grip a vehicle’s steering wheel with both hands, a couple moment is applied to the wheel. School of Engineering, Fall 2009 Would older vehicles without power steering have larger or smaller steering wheels?
440:221 Lectures reliminary Questions In statics a couple is defined as separated by a perpendicular Preliminary Questions … 1. In statics, a couple is defined as __________ separated by a perpendicular distance. A) two forces in the same direction ) two forces of equal magnitude 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 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 School of Engineering, Fall 2009 A) Free

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440:221 Lectures oment a OUPLE Moment a COUPLE A couple is defined as two parallel forces with the same magnitude but
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Lecture+09 - 440:221 Intro to Engineering Mechanics Statics...

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