Summary
The "rotational mass" of an object is called its moment of inertia, is labeled I, and depends upon how the mass is distributed. In particular,
I = 
m r2
With rotational motion, we have another form of Kinetic Energy,
KE = (1/2) I 
2
As before, the total energy is conserved,
KErot,i + KEtrns,i + PEi = KErot,f + KEtrns,f + PEf
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