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Then, using the relation ω=ω0*e^(-βt)

where ω0 was the initial angular velocity and β is some constant.

We then graphed the values of ln(ω) vs time, and found a linear relationship:

ln(ω)=ln(ω0) -βt

Thus, from the slope, we determined a value for β, and therefore the frictional torque depends on angular velocity. However, I still don't understand why.

Can you guys help explain this?