Coefficient of kinetic friction for wood on aluminum---ZiTong Cheng

Questions:
1.For each new block mass, calculate the magnitude of the kinetic frictional force from the measured t.  Also determine the normal force on the block.

2.Graph the magnitude of the kinetic frictional force against the magnitude of the normal force, for a constant angle of incline.   On the same graph, show your predicted relationship.

3.For each angle (h), calculate the magnitude of the kinetic frictional force from the measured t.  Also determine the normal force on the block.

4.Graph the magnitude of the kinetic frictional force against the magnitude of the normal force for a constant block mass.   On the same graph, show your predicted relationship.

5.Calculate the uncertainty in your experimental technique.    Do your two graphs agree?

6.Conclusion:What is the coefficient of kinetic friction for wood on aluminum?   How does this compare to your prediction 

Answer:

1 and 3


2.

4.


5.

two graph not compeletely agree, but final value is fine.

6.
The coefficient of kinetic friction for wood on aluminum I search online is:  0.2-0.4

The prediction I made for coefficient of kinetic friction for wood on aluminum: 0.38 +/- 0.083

Therefore, our value match the actual value!

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