Where and why do the passengers deviate in relation to the bus when it starts abruptly

Where and why do the passengers deviate in relation to the bus when it starts abruptly from a place brakes turns to the left?

If the bus moves evenly and in a straight line, then the passengers sit quietly in the cabin. However, if the bus starts to move with acceleration (when braking, when picking up speed, with a sharp turn), according to Newton’s second law, the inertia force begins to act on passengers, which is equal to m * a, and is directed in the direction opposite to acceleration. That is, with a sharp braking (acceleration of the bus is directed backward), passengers are sharply pushed forward when the bus picks up speed (acceleration is directed forward), passengers are “pressed” into the backs of the seats when they turn left (acceleration is directed toward the turn), passengers are pushed to the right …