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?
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 .
MOMENT OF A COUPLE (continued) The net external effect of a couple is that the net force equals zero and the

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• Spring '10
• Freeman

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