Constant acceleration as bus passenger can be fully compensated by just leaning at an angle. This is not unpleasant. But if the jerk (or higher derivatives) ar

Constant acceleration as bus passenger can be fully compensated by just leaning at an angle. This is not unpleasant. But if the jerk (or higher derivatives) are non-zero, you have to change your "lean angle" quickly to avoid getting jerked around (which is obviously much more disruptive).