Lecture 36 sect 8.3

Lecture 36 sect 8.3 - Wedges Wedges are a simple means for...

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ME221 Lecture 36 1 ME 221 Statics Lecture #36 Sections 8.1 – 8.3
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ME221 Lecture 36 2 Homework #12 Chapter 8 problems: Due Today
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ME221 Lecture 36 3 No Class Friday, December 5
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ME221 Lecture 36 4 Quiz #8 Today Friction problem
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ME221 Lecture 36 5 Final Exam Section 1 (3:00pm) Monday, 12/8, 3:00 – 5:00pm Section 2 (12:40pm) Wednesday, 12/10, 12:45 – 2:45pm See University policy for multiple exams
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ME221 Lecture 36 6 Chapter 8 - Friction Last Lecture Friction angle Coulomb Friction Today Wedges
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ME221 Lecture 36 7 Coulomb Friction (dry friction) Friction force (ƒ) is proportional to the normal force ( N ) and opposes motion Coefficient of friction, μ , is the proportionality constant – Static coefficient, s – Kinematic coefficient, k k N s N P f P N f W f=P
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ME221 Lecture 36 8 Friction:
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Unformatted text preview: Wedges Wedges are a simple means for lifting Again, friction force opposes the motion FBDs are essential for solving problems Apply equilibrium equations to FBDs ME221 Lecture 36 9 Friction: Wedges Wedges may exert large normal forces Used to lift heavy objects Also used for splitting Friction holds wedge in place May be used in pairs ME221 Lecture 36 10 Wedges The angle is called the wedge angle , and it determines the amount of force P required to raise the weight W , as well as the change in height of the weight as the wedge is driven into place. N f W P In equilibrium (P = 0): cos N sin = 0 s = tan ME221 Lecture 36 11 Example Problem...
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This note was uploaded on 07/25/2008 for the course ME 221 taught by Professor Buch during the Summer '08 term at Michigan State University.

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Lecture 36 sect 8.3 - Wedges Wedges are a simple means for...

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