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Part of JME-04 — Rotational Motion & Moment of Inertia

Dimensional Analysis of Rotational Quantities

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QuantityExpressionDimensions
Angular velocityomega = d(theta)/dt[T^{-1}]
Angular accelerationalpha = d(omega)/dt[T^{-2}]
Torquetau = r x F[ML^2T^{-2}]
MOII = mr^2[ML^2]
Angular momentumL = I*omega[ML^2T^{-1}]
Rotational KE(1/2)I*omega^2[ML^2T^{-2}]

Note: Torque and work/energy have the same dimensions [ML^2T^{-2}] but are physically different quantities. Torque is a vector (cross product); energy is a scalar.

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