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ME214StaticsChapter8

# ME214StaticsChapter8 - ME 214 Vector Statics Chapter 8 Dry...

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ME 214 Vector Statics Chapter 8 Dry Friction Instructor: A Rezaei Today’s Objective: Students will be able to: Students will be able to: a) Understand the characteristics of dry friction. b) Draw a FBD including friction. c) Solve problems involving friction. a) Characteristics of Dry Friction = The maximum friction force is attained just before the block begins to move (a situation that is called “impending motion”). The value of the force is found using Fs = μ s N, where μ s is called the coefficient of static friction. The value of μ s depends on the materials in contact. Once the block begins to move, the frictional force typically drops and is given by Fk = μ k N. The value of μ k (coefficient of kinetic friction) is less than μ s . Determining μ s Experimentally (demonstrated in class) =

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STEPS FOR ANALYSIS involving Dry Friction 1. Draw a FBD, show the friction force opposite to the motion. 2.
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ME214StaticsChapter8 - ME 214 Vector Statics Chapter 8 Dry...

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