Lecture 24 - ENGR-1100 Introduction to Engineering Analysis...

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ENGR-1100 Introduction to Engineering Analysis Lecture 24 Notes courtesy of: Prof. Yoav Peles

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Homework Assignment (due next class) Problem 9-8 Problem 9-16 Problem 9-26
Today Lecture outline Dry friction (Coulomb friction)

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Friction Friction forces oppose the tendency of contacting surfaces to slip one relative to the other. Dry friction- the tangential component of the contact force. Fluid friction-
Friction Forces have to be concurrent in order to be in equilibrium.

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Friction forces as a function of P Maximum value of friction forces is called the limiting value of static friction . This condition is also called the impending motion
Tip vs. slip Body Tips F 1 P 2 > P 1 F 2

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The magnitude of the friction forces F max = μ s N Where μ s is the coefficient of static friction. It is independent of normal forces and area of contact F< μ s N The general case for equilibrium condition Once the body starts to slip F= μ k N μ k is the coefficient of dynamic friction k s
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Lecture 24 - ENGR-1100 Introduction to Engineering Analysis...

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