A passenger feels thrown sideways as a car turns. How is that feeling described?

1. The passenger tends to continue in a straight line, as Newton's first law requires. 2. The car turns out from under them, so relative to the car they appear to slide sideways. 3. No real outward force acts, so the apparent push is called a fictitious force. 4. It arises only because the observer's frame of reference is itself accelerating or rotating. _Source: OpenStax College Physics (CC BY 4.0), Ch 6 "Uniform Circular Motion and Gravitation", section 6.4 Fictitious Forces and Non-inertial Frames: The Coriolis Force_