Ah, these are all about how things spin, baba. Rotational motion is like our old ceiling fan turning; moment of inertia is its reluctance to start or stop, just like our heavy shop shutter. Torque is the push you apply to the shutter handle, and angular momentum is the fan once it's going. Rolling without slipping? Watch the tea vendor's cartwheel—the point touching the road is still for a moment. I teach this with a chalk circle rolled on the desk, because we have no fancy lab wheels. The book says it's complex, but seeing that cartwheel struggle on the mud path shows it's about grip, not just equations.
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