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ElizabethE:Static Friction

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http://scratchpad.wikia.com/wiki/Final_Exam_Study_2008


What physics explanations/relationships did you use to find the maximum coefficient of static friction?

Experiment 1: According to Newton's second law, the sum of the forces is equal to the net force which in this case is centripital force. Fs = m(v^2)/r = m(w^2)r The radius at which the cion starts to slip is the point where the maximum statics friction must be measured. Then the coefficient of static friction is gotten from the equation Fs = mu*N.

Experiment 2: Here we must use Newton's second law in component form. Fs = mu*mg*sin(theta) where theta is the angle measured from the horrizontal.


Did the assumptions that you made allow you to use these explanations/relationships?

Experiment 1: It was assumed that the angular speed was constane and the disk was uniform.

Experiment 2:



Did the results from the two experiments match? If not, how do you need to modify your assumptions to change the mathematical procedure?

Make a list of sources of uncertainties in determining the maximum coefficient of static friction in each experiment. How can you minimize the uncertainties?

Experiment 1:

Experiment 2:



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