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    Physics - Coefficients of Static and Kinetic Friction

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    A 23.0 kg block is initially at rest on a horizontal surface. A horizontal force of 70.0 N is required to set the block in motion. After it is in motion, a horizontal force of 56.0 N is required to keep the block moving with constant speed. Find the coefficients of static and kinetic friction from this information.
    µs =
    µk =

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    © BrainMass Inc. brainmass.com December 24, 2021, 7:38 pm ad1c9bdddf
    https://brainmass.com/physics/newtons-laws/physics-coefficients-static-kinetic-friction-204947

    SOLUTION This solution is FREE courtesy of BrainMass!

    (1) The force F of static friction is the force required to set the block in motion, namely, 70 N.

    F = (mu) * mass * g

    70 = (mu) * 23 * 9.8

    mu = 70 / (23 * 9.8) = 0.31

    The coefficient of static friction, mu(static), is 0.31.

    (2) The force F of kinetic friction is the force required to keep the block moving at constant speed, namely, 56 N.

    F = (mu) * mass * g

    56 = (mu) * 23 * 9.8

    mu = 56 / (23 * 9.8)

    mu = 0.248

    The coefficient of kinetic friction, mu(kinetic), is 0.248.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 7:38 pm ad1c9bdddf>
    https://brainmass.com/physics/newtons-laws/physics-coefficients-static-kinetic-friction-204947

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