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## PowerPoint Slideshow about 'Friction' - cheng

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### Friction

Don’t rub me the wrong way!

Kinds of friction

- Static
- Exists between two surfaces that are NOT moving relative to each other
- Kinetic
- Exists between two surfaces that ARE moving relative to each other
- In MOST instances….
- Static friction is greater than kinetic friction

Proportional to the Normal Force

- Ff= μs FN : Magnitude of frictional force due to static friction
- Static Coefficient of Friction - μs
- Ff= μkFN : Magnitude of frictional force due to kinetic friction
- Kinetic Coefficient of Friction - μk

μ – “mu” – small Greek letter M

- symbol for coefficient of friction

Tribology

- Contact Mechanicsof Moving Interfaces
- Generally involves energy dissipation
- Also encompasses the science fields of:
- Adhesion
- Friction
- Lubrication
- Wear

Friction Theory

- Surface imperfections
- Inter-particle attractions
- Other?

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