What stops a car from moving forward or backward
friction stops things from moving and slows it down
your motion stops
The only thing that can do that is force.
Gravity
Friction.
The friction produced that stops an object moving when force is applied is 'static friction'.
A moving object stops when its force is used up. The resistance to change its motion is known as inertia.
It continues to move.
It is the force of inertia.
This is not a force, but your conservation of momentum. For there to be a force, you must have some acceleration, but what you feel is actually your body attempting to continue moving forward until the force of friction and force normal of your seat belt decelerate you.
inertia