A bus travelling straight makes a sharp right turn. What will happen to the passengers aboard the bus?

Newton's first law of motion: It states that an object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.

The inertia of the bus changes when it makes a sharp right turn. However, the passengers' inertia remains in the straight direction. As a result, they will shift to the left.