The co-efficient of friction mu can be determined in an experiment by measuring the force F required to move a mass m. when F is measured and m is known the coefficient of friction can be calculated by mu=F/mg (g=9.81 m/sec2) results from measuring F in six tests are given in the table below. Determine the coefficient of friction in each test, and average from all tests.

Problem: 
                         The co-efficient of friction mu can be determined in an experiment by measuring the force F required to move a mass m. when F is measured and m is known the coefficient of friction can be calculated by mu=F/mg (g=9.81 m/sec2) results from measuring F in six tests are given in the table below. Determine the coefficient of friction in each test, and average from all tests.

    Test #
    1
    2
    3
    4
    5
    6
    Mass m-kg
    2
    4
    5
    10
    20
    50
    Force F -N
    12.5
    23.5
    30
    61
    117
    294


    USING MATLAB SOFTWARE

    SOLUTION:

    %IN COMMAND WINDOW

    >> m=[2 3 5 10 20 50];
    >>  f=[12.5 23.5 50 61 117 294];
    >>  mu=f./(m*9.8)

    mu =

        0.6378    0.7993    1.0204    0.6224    0.5969    0.6000

    >> mu_avg=mean(mu)

    mu_avg =

        0.7128
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