While braking and slowing down, what force of nature is applied on the vehicle?

The force of inertia, i.e. the force which causes the vehicle to continue moving.

No force of nature affects the vehicle while it is braking or slowing down.

The centrifugal force, i.e. the force applied on the vehicle when it is turning.

The lift force, i.e. the force that pulls the vehicle upwards.