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It keeps you from moving forward if the car is hit or stops suddenly.
What stops a car from moving forward or backward
When car was moving, passengers were also moving. When car suddenly stops, the moving passengers try to maintain their state of forward motion because of their inertia. so they move forward relative to their seats...
When a glacier stops moving and end moraine will be deposited in front of it.
inertia
inertia
Moraine
A Person sitting in a moving car fall forward , when the car stops suddenly. Athlete run some distance , before taking a long jump.
True ... it's called inertia.
Slimp
Force of Inertia
because when the car is moving really fast then stops suddenly the seat belt locks. If the seat belt didn't lock, then you would fly forward.