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