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Ch 8 Lecture Notes on Friction Revised version ppt

# Ch 8 Lecture Notes on Friction Revised version ppt -...

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PROPERTIES OF DRY FRICTION THEORY AND ANALYSIS Properties and Characteristics of Dry Friction

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ANALYSIS OF DRY FRICTION: CONTINUED…. Problem FBD Equations Comments Values of 0 1 s s μ < <
Direction of Force of Friction Relative Slide Law

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Analysis Flowchart of Problems with Dry Friction
Angle of Static Friction: Physical Interpretation Angle of Friction: Definition Physical Interpretation ( 29 1 tan s s θ μ - = Limiting Equilibrium – Motion Impending tan tan s s s s F N N N μ θ = μ = θ θ θ To maintain equilibrium , s s F N θ = θ = μ

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Some Key Concepts in the Analysis of Friction A Rough Surface does not necessarily generate friction • Friction is an automatically generated reaction; Its purpose is to prevent relative sliding. An example is given below. A Classical Problem: A Rod Resting Between a Floor and Wall
Various Cases 0 B F = 0 gives 0. Then 0 = = = x A A F N F 0 μ = A s A F N 0 gives = = y B F N W ( 29 , B W N 1. Friction at B is zero, Recall that Thus forms a couple, but there is no balancing couple to maintain equilibrium. Hence equilibrium is not possible,

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Ch 8 Lecture Notes on Friction Revised version ppt -...

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