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Friction

Friction. What is friction?. Friction is a resistive force caused by two surfaces sliding across each other. Always acts opposite the direction of motion. Types of Friction. Static Friction - F s Friction force between two stationary surfaces. Kinetic Friction – F k

cynthia-nolan
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Friction

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  1. Friction

  2. What is friction? • Friction is a resistive force caused by two surfaces sliding across each other. • Always acts opposite the direction of motion

  3. Types of Friction • Static Friction - Fs • Friction force between two stationary surfaces. • Kinetic Friction – Fk • Friction force between two sliding surfaces. • Fs is always greater than Fk • Harder to start moving than to keep moving

  4. Coefficient of Friction • Coefficient of friction describes how rough the surface is. Higher is rougher. • Denoted by the Greek letter mu (μ) • pronounced “mew” • μs = coefficient of static friction • μk = coefficient of kinetic friction • μ is always positive, usually between 0 and 1.

  5. Equation • Regardless of type (static or kinetic) • To find static friction, use μs • To find kinetic friction, use μk

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