# ElizabethE:Static Friction

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## 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:

Experiment 1:

Experiment 2: