Analysis of Coefficient of Friction and Normal Force

Constant Height (1 & 2)

With a constant height of 0.5 m, the friction force and the normal force was calculated in excel using an input of the equations derived. The friction coefficient in this experiment with constant height was 0.94. This does not fit in the predicted range of 0.2-0.6. since the more mass was added per trial, the friction force increased higher and higher.

Constant Mass (3 & 4)

Using the same equations, the friction force and the normal force were calculated. In this experiment, the mass remained constant at 90 grams, and the height was changed per trial. The friction coefficient found was 0.98 which does not fit in the predicted 0.2-0.6 friction coefficient. 

UNCERTAINTY:

The uncertainty of the coefficients of friction is: 0.9626 +- 0.0272

CONCLUSION:

The coefficient of friction for wood and aluminum is 0.96 when the mass is constant. This does not fit in the prediction that coefficient is between 0.2-0.6.