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# Friction

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Brief description on friction theory

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### Friction

1. 2. <ul><li>Objectives: </li></ul><ul><ul><li>To introduce the concept of dry friction </li></ul></ul><ul><ul><li>To understand how dry friction works </li></ul></ul><ul><li>Learning Outcomes: </li></ul><ul><ul><li>At the end of this session, student should be able to: </li></ul></ul><ul><ul><li>Briefly define what is friction </li></ul></ul><ul><ul><li>Sketch a basic free-body diagram of a normal friction </li></ul></ul>
2. 3. <ul><li>Definition: </li></ul><ul><li>“ .. 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 in contact ” </li></ul>
3. 4. <ul><li>Types of friction: </li></ul><ul><ul><li>Fluid friction </li></ul></ul><ul><ul><li>Dry friction √ </li></ul></ul><ul><li>Law of Dry friction: </li></ul><ul><li>“ ..occurs between the contacting surfaces of bodies in the absence of lubricating fluid ” </li></ul>
4. 5. <ul><li>Characteristics of dry friction: </li></ul><ul><ul><li>Acts tangent to contacting surfaces </li></ul></ul><ul><ul><li>In a direction opposed to the relative motion </li></ul></ul><ul><ul><li>In absence of lubricating fluid </li></ul></ul>
5. 6. <ul><li>SUMMARY </li></ul><ul><li>Q & A </li></ul>