Mechanics
Moment of Inertia (Point Mass)
Rotational equivalent of mass for a point mass.
Variables
Ikg·m²
Moment of inertia
Rotational inertia
mkg
Mass
Point mass
rm
Distance
Distance from axis
Derivation
Definition: I = Σmᵢrᵢ² for discrete masses.
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Common questions
What is the Moment of Inertia (Point Mass) formula?
Moment of Inertia (Point Mass) is written I = mr². Rotational equivalent of mass for a point mass. It belongs to Mechanics, under Rotational Motion.
What are the units in I = mr²?
In SI units, I is moment of inertia, measured in kg·m²; m is mass, measured in kg; r is distance, measured in m.
How is the Moment of Inertia (Point Mass) formula derived?
Definition: I = Σmᵢrᵢ² for discrete masses. The result is I = mr².