Why does wearing a car seat belt reduce the impact force on the wearer?

Wearing a car seat belt reduces the impact force on the wearer by distributing the force of a collision across stronger parts of the body, such as the chest and pelvis. This helps to prevent serious injuries by slowing the wearer down more gradually, rather than allowing them to be thrown forward at high speed. Additionally, seat belts prevent occupants from being ejected from the vehicle during an accident, which significantly increases the chances of survival and reduces injury severity.