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Published byErick Collins Modified over 9 years ago
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Friction is a resistive force caused by two surfaces sliding across each other. Always acts opposite the direction of motion
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Static Friction - F s Friction force between two stationary surfaces. Kinetic Friction – F k Friction force between two sliding surfaces. F s is always greater than F k Harder to start moving than to keep moving
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Coefficient of friction describes how rough the surface is. Higher is rougher. Denoted by the Greek letter mu (μ) pronounced “mew” μ s = coefficient of static friction μ k = coefficient of kinetic friction μ is always positive, usually between 0 and 1.
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Regardless of type (static or kinetic) To find static friction, use μ s To find kinetic friction, use μ k
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