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Thread: help w/ a algebra physics problem

  1. February 22nd 2010, 09:22 PM #1
    cknicker
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    help w/ a algebra physics problem

    i cant find out what the correct formula is that i should be using for this problem:

    crate has a mass of 27.3kg, its acceleration is 1.15 m/s^2 when it is pulled with a force of 92.6N, what is the coefficient of kinetic friction?

    id appreciate any help.
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  2. February 22nd 2010, 09:46 PM #2
    Black
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    You'll use Newton's 2nd Law. In this case:

    F-f_k=ma,

    where

    m=27.3 \, \text{kg},

    F=92.6 \, \text{N},

    a=1.15 \, \text{m/s}^2,

    f_k=\mu_kmg= force of kinetic friction,

    g=9.80 \, \text{m/s}^2.

    Solve for \mu_k.
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