Hello, I'm studying energy right now and I don't understand something: if we have a disk rolling without slipping, then obviously there is friction to induce the rolling right? So if we were to model this with an energy equation, would we have U + Wf = K where U is potential energy, Wf is work due to friction, and K is kinetic energy? OR would you have U = K + Kr where Kr is rotational energy? or some combination? Thanks!

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Why can't you/don't you account for work done by friction?

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