The kinetic energy of the object (mass m)
is, as usual, given by
Ekin
= m v2 /2
= m ( ω R )2 /2
= mR2
ω2 /2
The combination
mR2
is called the moment of inertia
of the system of an
object
and its center of rotation.
We will use the symbol I for the
moment of inertia:
Ekin
= I ω2 /2
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