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ch4_1_student_notesF2010

# ch4_1_student_notesF2010 - MOMENT OF A FORCE(Section 4.1...

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MOMENT OF A FORCE (Section 4.1) Today’s Objectives : a) understand and define moment, and, b) determine moments of a force in 2-D and 3-D cases. In-Class Activities : Applications Moment in 2-D Moment in 3-D Problems and questions Moment of a force

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APPLICATIONS What is the net effect of the two forces on the wheel?
APPLICATIONS (continued) What is the effect of the 30 N force on the lug nut?

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MOMENT IN 2-D The moment of a force about a point provides a measure of the tendency for rotation (sometimes called a torque).
MOMENT IN 2-D (continued) In the 2-D case, the magnitude of the moment is M o = F d 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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MOMENT IN 2-D (continued) For example, M O = F d and the direction is counter-clockwise. Often it is easier to determine M O by using the components of F as shown.
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ch4_1_student_notesF2010 - MOMENT OF A FORCE(Section 4.1...

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