# MSU ME 371 - Old Lecture 37 sect 8.3 (11 pages)

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## Old Lecture 37 sect 8.3

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## Old Lecture 37 sect 8.3

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Pages:
11
School:
Michigan State University
Course:
Me 371 - Mechanical Design I
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ME 221 Statics Lecture 37 Sections 8 1 8 3 ME221 Lecture 36 1 Homework 12 Chapter 8 problems 1 2 4 8 15 Due Today ME221 Lecture 36 2 No Class Friday December 5 ME221 Lecture 36 3 Quiz 8 Today Friction problem ME221 Lecture 36 4 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 ME221 Lecture 36 5 Chapter 8 Friction Last Lecture Coulomb Friction Coefficients static kinematic Friction angle Today Wedges ME221 Lecture 36 6 Coulomb Friction dry friction Friction force is proportional to the normal force N and opposes motion Coefficient of friction is the proportionality constant f Static coefficient s Kinematic coefficient k W P ME221 f P f N sN kN P Lecture 36 7 Friction 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 8 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 9 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 In equilibrium P 0 cos N sin 0 s tan ME221 W P Lecture 36 N f 10 Example Problem ME221 Lecture 36 11

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