The angular analogue of every linear quantity: moment of inertia of a uniform rod, radius of gyration, torque as Ialpha, rotational work and power, angular momentum conservation and the rolling energy split.
Unit 1 carries 10 of the 50 physics marks; with eight chapters sharing them, this one averages a little over one (MEC publishes weights by unit, not by chapter). Rotational dynamics is the smallest-looking chapter in the unit and the easiest to score in, because almost all of it is Dynamics with every symbol swapped for its angular partner. Learn the translation table and you have learned the chapter.
The MEC scope line runs: Moment of inertia (rigid uniform rod only) and radius of gyration; torque, work, energy and power in rotational motion. The two headings below are its two points, in MEC's order. Note the bracket: the syllabus restricts the moment-of-inertia derivations to a uniform rod. The disc, ring and sphere are still worth carrying, because rolling questions need them, but the rod is what can be asked to be derived.
Three ways it comes:
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