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Frictional Force

Frictional Force. Force of friction depends on the surfaces in contact and the Normal Force between them. Friction Force. Ff = μ Fn Ff = force of friction, Fn = normal force μ = coefficent of friction which is a property of the materials involved.

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Frictional Force

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  1. Frictional Force Force of friction depends on the surfaces in contact and the Normal Force between them

  2. Friction Force • Ff = μFn • Ff = force of friction, Fn = normal force • μ = coefficent of friction which is a property of the materials involved. • μ is a number without units and is typically has a value between 0.1 and 1.

  3. Frictional Force • Values for the coefficient of friction, μ

  4. Frictional Force • Use the Frictional Force equation whenever there is a force = mass x accel problem (F = ma_) involving friction

  5. Force of Friction • Solving problems with friction • Draw force diagram • Write Fnet = ma for both x- and y- axis • Solve

  6. Force of Friction • Block of wood pulled across table • Mass = 5kg, Fpull = 60N, μ = 0.4 • Find acceleration of block

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