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Lecture 34 sect 8.1
Course: ME 221, Summer 2007School: Michigan State University
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ME 221 Statics Lecture #34 Sections 8.1 8.2 ME221 Lecture 34 1 Homework #11 Chapter 6 problems: 2, 3, 6 & 7 Method of Joints 32, 36, 47 & 53 Method of Sections 68 & 75 Due Today ME221 Lecture 34 2 Homework #12 Chapter 8 problems: 1, 2, 4, 8 & 15 Due Monday, December 1 ME221 Lecture 34 3 Quiz #7 Today Analysis of Structures Method of Joints or Method of Sections ME221...
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ME 221 Statics Lecture #34 Sections 8.1 8.2 ME221 Lecture 34 1 Homework #11 Chapter 6 problems: 2, 3, 6 & 7 Method of Joints 32, 36, 47 & 53 Method of Sections 68 & 75 Due Today ME221 Lecture 34 2 Homework #12 Chapter 8 problems: 1, 2, 4, 8 & 15 Due Monday, December 1 ME221 Lecture 34 3 Quiz #7 Today Analysis of Structures Method of Joints or Method of Sections ME221 Lecture 34 4 No Class Wednesday, November 26 ME221 Lecture 34 5 No Class Friday, December 5 <a href="/keyword/mechanical-engineering-design/" >mechanical engineering design</a> Conference MSU Union 9am to noon Demonstrations 1pm to 2pm Awards in Ballroom ME371 Mechanical Design I ME412 Heat Transfer Lab ME456 Mechatronics Systems Lab ME471 Mechanical Design II ME481 Mech Engineering Design Projects ME221 Lecture 34 6 Chapter 8 - Friction Overview Types Coulomb friction (dry friction) Static and kinematic Fluid friction Wedges ME221 Lecture 34 7 Friction Angle A body on an incline, acted upon by gravity alone, will slip at an angle related to the coefficient of friction From the FBD: N W cos = 0 & W sin = 0 Such that: = N tan (friction force) ME221 Lecture 34 8 Friction Angle The Coefficient of Static Friction (ms) is defined as the tangent of the maximum angle a body may be inclined before slip occurs ms = tan max = max / N The angle max is called the friction angle ME221 Lecture 34 9 Coulomb Friction (dry friction) Friction force () is proportional to the normal force (N) and opposes motion Coefficient of friction, m, is the proportionality constant f Static coefficient, ms W P f ME221 Kinematic coefficient, mk msN mkN f=P P N Lecture 34 10 Common Static Friction Coefficients Steel on steel Rubber on concrete Rubber on ice Metal on wood Teflon on Teflon Tires on gravel ME221 0.75 0.5-0.9 0.05-0.30 0.2-0.6 0.04 0.5 11 Lecture 34 Example Problem ME221 Lecture 34 12 Quiz #7 ME221 Lecture 34 13 Friction: Wedges Wedges are a simple means for lifting Again, friction force opposes the motion Disassembled FBDs are essential for solving wedge problems Apply equilibrium equations to disassembled FBDs Examples: 8.71, 8.72, 8.80, 8.45 ME221 Lecture 34 14
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