Physics Ontology

One map of physics, three ways in. Drill down on any quantity to see its units, the equations it lives in, and how its values span the universe.

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JJ
Mechanics

Moment of Inertia

Resistance to angular acceleration.

SI unit

kilogram metre squared (kg·m²)

Dimension: [ ML2 ][\,M L^2\,]

Other units

  • kilogram metre squared (kg·m²)

Order of magnitude

How values of moment of inertia span the physical world (in kg·m², log scale).

Spinning coin
10-6 kg·m²
Flywheel
5.00 × 101 kg·m²
Earth
8.00 × 1037 kg·m²
Lower limit10-7 kg·m²Upper limit1038 kg·m²

Appears in 1 equation

Angular Momentum
L=JωL = J \omega