Chapter_08_1 - Chapter8 Friction 03/16/10 Chapter8Friction...

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03/16/10 Chapter 8 - Friction 1 Chapter 8 Friction
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03/16/10 Chapter 8 - Friction 2 OBJECTIVES 1. To introduce the concept of dry friction  and show how to analyze the  equilibrium of rigid bodies subjected to  this force. 2. To present specific applications of  frictional force analysis on wedges,  screws, and belts.
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03/16/10 Chapter 8 - Friction 3 Friction may be defined as a force of resistance acting on a body which prevents or retards slipping of the body relative to a second body or surface with which it is contact.
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03/16/10 Chapter 8 - Friction 4 This force acts tangent to the surface at points of contact with other bodies and is directed so as to oppose the possible or existing motion of the body relative to these points.
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03/16/10 Chapter 8 - Friction 5 Types of Friction 1. Fluid friction 1. Contacting Surfaces Separated by a Film  of Liquid or Gas. 2. This Type of Friction is Studied in Fluid  Mechanics. 2. Dry Friction (Coulomb Friction) 1. Friction Between Contacting Bodies in  the Absence of  a Lubricating Fluid.
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03/16/10 Chapter 8 - Friction 6
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03/16/10 Chapter 8 - Friction 7
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03/16/10 Chapter 8 - Friction 8 Frictional Force - F 1. Static-frictional force if equilibrium is  maintained. 2. Limiting static-frictional force if it  reaches its maximum value  of F s 3. Kinetic-frictional force when sliding  occurs.
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03/16/10 Chapter 8 - Friction 9
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03/16/10 Chapter 8 - Friction 10
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03/16/10 Chapter 8 - Friction 11
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03/16/10 Chapter 8 - Friction 12
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03/16/10 Chapter 8 - Friction 13 2 a x : tipping of Verge 2 a x W Ph x Ph Wx = = =
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03/16/10 Chapter 8 - Friction 14 μ s - coefficient of static friction φ s =tan -1 (F s /N)= tan -1 ( μ s N/N)= tan -1 ( μ s )
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03/16/10 Chapter 8 - Friction 15
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03/16/10 Chapter 8 - Friction 16 Typical values of 
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Chapter_08_1 - Chapter8 Friction 03/16/10 Chapter8Friction...

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