Center of mass
The
Center of mass of an object is the point where all of its mass is
concentrated. When an object is supported at its center of mass there is
no net torque acting on the body, so it will remain at equilibrium and
balance. If the center of mass surpasses the bass it is under, it will
lose balance and collapse.
Rotational Inertia
Rotational
inertia is a Scalar, this means that it is not a vector and is
dependent upon the radius of rotation, it is a measurement of an
object's resistance to change in its rotation. Change in rotation before
has to equal change in rotation after. So if an object had a great
rotational inertia and a low velocity, the same object after can have a
low rotational inertia with high velocity so that both change in
momentum are equal
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