Rotational forces overview
Spinning, rolling, and pitching — your head moves through a bigger arc than your seat.
Coaster trains pitch (nose up/down), roll (bank), and yaw (twist left/right) — often combined in inversions.
Your head is above the rotation axis, so it travels a larger path and experiences higher local accelerations than your hips.
Elements that look similar on POV can differ in roll rate — how fast banking changes per second.
Understanding rotation explains why some “mild” looking rolls feel violent and some huge loops feel calm.