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Lecture 05 - ME 221 Statics LECTURE#4 Sections 3.1 3.6 ME...

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ME 221 Lecture 5 1 ME 221 Statics LECTURE #4 Sections: 3.1 - 3.6
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ME 221 Lecture 5 2 Announcements HW #2 due Friday 5/28 Ch 2: 23, 29, 32, 37, 47, 50, 61, 82, 105, 113 Ch 3: 1, 8, 11, 25, 35 Quiz #3 on Friday, 5/28 Exam #1 on Wednesday, June 2
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ME 221 Lecture 5 3 Chapter 3 Rigid Bodies; Moments Consider rigid bodies rather than particles Necessary to properly model problems Moment of a force about a point Problems Moment of a force about an axis Moment of a couple Equivalent force couple systems
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ME 221 Lecture 5 4 Rigid Bodies The point of application of a force is very important in how the object responds F F We must represent true geometry in a FBD and apply forces where they act.
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ME 221 Lecture 5 5 Transmissibility A force can be replaced by an equal magnitude force provided it has the same line of action and does not disturb equilibrium B A
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ME 221 Lecture 5 6 Moment A force acting at a distance is a moment Transmissibility tells us the moment is the same about O or A F d M O M A d is the perpendicular distance from F ’s line of action to O Defn. of moment: M = F • d
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ME 221
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