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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