Transcription of Chapter 8: Friction - CAU
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Chapter 8: Friction - CAU
Chapter 8: FrictionSchool of Mechanical Engineering of Dry Friction . Coefficients of of FrictionProblems Involving Dry FrictionSample Problem Problem ScrewsSample Problem Bearings. Axle Bearings. Disk Friction . Rolling Problem Problem of Mechanical Engineering8 -2 IntroductionLaws of Dry Friction . Coefficients of of FrictionProblems Involving Dry FrictionSample Problem Problem ScrewsSample Problem Bearings. Axle Bearings. Disk Friction . Rolling Problem Problem In preceding chapters, it was assumed that surfaces in contact were either frictionless(surfaces could move freely with respect to each other) or rough(tangential forces prevent relative motion between surfaces).
•Square-threaded screws frequently used in jacks, presses, etc. Analysis similar to block on inclined plane. Recall friction force does not depend on area of contact. •Thread of base has been “unwrapped” and shown as straight line. Slope is 2prhorizontally and lead Lvertically. •Moment of force Qis equal to moment of force P.Q=Par
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