Mechanics

Moment of Inertia (Solid Sphere)

Moment of inertia of a uniform solid sphere rotating about any diameter.

Variables

I
Moment of inertia
Rotational inertia
kg·m²
M
Mass
Total mass of sphere
kg
R
Radius
Radius of sphere
m

Derivation

I = ∫r²dm. Using spherical coordinates and integrating over the volume gives I = (2/5)MR².

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