Analysis

1. Setup a results table with average acceleration (of the three trials), average friction force (calculated from Newton's second law F = ma)  and total normal force of the sliding block.

2. Plot a graph of average acceleration and normal force .

•  Does the acceleration depend on the weight of the block?

3. Calculate the mean (average) value of your accelerations from all trials.  

4. Calculate the mean absolute deviation, which is a calculated value for the uncertainty of a mean value.  The equation for the mean absolute deviation can be found here

5. From the mean value of the acceleration determine the coefficient of kinetic friction.  Use a value of g = 9.81 m/s^2, as an exact value for your calculation.