Lecture 06 - Lecture 06 * * * * MOMENT OF A FORCE SCALAR...

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Lecture Notes for Sections 4.1-4.4 1 Lecture 06 * MOMENT OF A FORCE SCALAR FORMULATION * CROSS PRODUCT * MOMENT OF A FORCE VECTOR FORMULATION * PRINCIPLE OF MOMENTS PRINCIPLE OF MOMENTS Section 4.1-4.4 Ehab Zalok MOMENT OF A FORCE SCALAR FORMULATION, CROSS PRODUCT, MOMENT OF A FORCE VECTOR FORMULATION, & PRINCIPLE OF MOMENTS Objectives : Students will be able to: a) understand and define moment, and, b) determine moments of a force in 2-D and 3-D cases. 2 http://www.dickwhitney.net/LilWillie.html
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Lecture Notes for Sections 4.1-4.4 2 READING QUIZ 1. What is the moment of the 10 N force about point A (M A )? A) 10 N·m B) 30 N·m C) 13 N·m F = 10 N D) (10/3) N·m E) 7 N·m 2. Moment of force F about point O is defined as M O = ___________ . A d = 3 m 3 A) r x F B) F x r C) r F D) r * F APPLICATIONS 4 What is the net effect of the two forces on the wheel?
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Lecture Notes for Sections 4.1-4.4 3 APPLICATIONS (continued) 5 What is the effect of the 30 N force on the lug nut? MOMENT OF A FORCE - SCALAR FORMULATION (Section 4.1) x O F M o = F d y M o 6 The moment of a force about a point provides a measure of the tendency for rotation (sometimes called a torque).
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Lecture Notes for Sections 4.1-4.4 4 MOMENT OF A FORCE - SCALAR FORMULATION (continued) In the 2-D case, the magnitude of the moment is M o = F d 7 As shown, d is the perpendicular distance from point O to the line of action of the force. In 2-D, the direction of M O is either clockwise or counter-clockwise depending on the tendency for rotation.
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This note was uploaded on 02/28/2011 for the course MATH 101 taught by Professor Duke during the Spring '11 term at University of Ottawa.

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Lecture 06 - Lecture 06 * * * * MOMENT OF A FORCE SCALAR...

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