When do I use τ = Iα in Rotational Motion, and what does it mean?
rotational Newton's second law (torque = moment of inertia × angular acceleration).
τ = Iα — rotational Newton's second law (torque = moment of inertia × angular acceleration). Use it when: about a fixed axis. Always check the condition holds before plugging in numbers.
Key point
τ = Iα
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