ch4_6_student_notesF2010

ch4_6_student_notesF2010 - MOMENT OF A COUPLE(Section 4.6...

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MOMENT OF A COUPLE (Section 4.6) Today’s Objectives : a) define a couple, and, b) determine the moment of a couple. In-Class activities : Applications Moment of a Couple Problems Questions
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APPLICATIONS A torque or moment of 12 N · m is required to rotate the wheel. Which one of the two grips of the wheel above will require less force to rotate the wheel?
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APPLICATIONS (continued) The crossbar lug wrench is being used to loosen a lug net. What is the effect of changing dimensions a, b, or c on the force that must be applied?
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MOMENT OF A COUPLE (Section 4.6) A couple is defined as two parallel forces with the same magnitude but opposite in direction separated by a perpendicular distance d. 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). Here r is any position vector from the line of action of –F to the line of action of F .
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MOMENT OF A COUPLE (continued) The net external effect of a couple is that
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ch4_6_student_notesF2010 - MOMENT OF A COUPLE(Section 4.6...

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