How does seat belts affect momentum?

Seat belts affect momentum by providing a counteracting force that reduces the risk of injury during a sudden stop or collision. When a vehicle decelerates rapidly, the momentum of the occupants continues forward unless restrained. Seat belts help to secure occupants in place, minimizing the change in momentum experienced by the body and reducing the likelihood of impacting the interior of the vehicle or being ejected. This safety feature effectively distributes the forces exerted during a crash, helping to protect passengers.