ch4_1lecture - MOMENT OF A FORCE (Section 4.1) Todays...

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MOMENT OF A FORCE (Section 4.1) Today’s 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. Moment of a force
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APPLICATIONS What is the net effect of the two forces on the wheel?
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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).
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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. Using this approach, M O = (F Y a) – (F X b). Note the different signs on the terms! The typical sign convention for a moment in 2-D is that counter-clockwise is considered positive.
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This note was uploaded on 04/20/2011 for the course ENG 1333 taught by Professor Brr during the Spring '10 term at American College of Computer & Information Sciences.

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ch4_1lecture - MOMENT OF A FORCE (Section 4.1) Todays...

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