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We then take these velocities and plug them into an energy equation (ET1 = ET2 or something like that) to find the energy lost. We use this to find 2 different energy lost amounts, and then use Wff = Ff(d)(cos180) to find the force of friction. We will get a different force of friction for each disk because they each had a different energy lost amount.

Now here is the question: if I know the normal force and stick the force of friction into the coefficient equation: Ffk = μkFn, I will get different coefficients for each disk. Why is that? I thought the coefficient depended on the material and the surface? In this case both are the same. Unless being magnetized changes the coefficient?

All help is appreciated!!