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Analysis
Moment of inertia, also called mass moment of inertia, rotational inertia or the
angular mass,It is a measure of an object's resistance to changes to its rotation. It is
the inertia of a rotating body with respect to its rotation.
The disk has an experimental
value of inertia of 142,869.79gcm
2
and the Ring has an
experimental value of inertia of
52,743.06gcm
2
. They have different moments of inertia because one is easier to be
rotated about
a desired axis ( about its center), meaning the one with much smaller
moment of inertia
needs lesser force to rotate, because its resistance to change in its
rotation is lesser
Even though the Disk and the Ring almost have the same mass, the Disk has a
greater moment of inertia because it produces greater Torque which means from the
formula of torque
T
=
r
x
F
where r is the radius or the length of its lever arm, where the
radius of the disk
is acting as its lever arm while the disk
is being rotated about its
center. And for the Ring, it has hollow shaped body, means that the we need to compute
first the difference of the radius from the outer ring to the inner ring therefore making
the lever arm more smaller thus easier for it to rotate therefore lesser moment of inertia\
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 Spring '11
 Agguire
 Physics, Resistance, Inertia, Mass

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