![]() ![]() These areas of the torso are two of the more sturdy parts of the body, so directing the force in those areas works to minimize the effect of the crash on the body. If worn properly, a seat belt will spread the stopping force across the seat belt wearer’s pelvis and rib cage. The seat belt usually stops this from happening. Without the seat belt, occupants can be thrown into various parts of the interior of the car, or thrown completely out of the car. When the vehicle hits something, or is hit by something, that inertia changes. A car moves with inertia, which is an object’s tendency to move until something works against the motion of that object. ![]() The seat belt functions by keeping the occupant in a more static motion despite a sudden stop or change in momentum. The main purpose of a seat belt is to keep vehicle occupants safe in the event of a crash. The first car companies to integrate seat belts were Nash and Ford, quickly followed by Saab. After his study was published, car manufacturers started to implement his idea of the retractable seat belt into their vehicle. ![]() It wasn’t until the early 1950’s when a doctor in California conducted a study that linked the rudimentary seat belts to a decline in the high quantity of head injuries that were coming into the hospital he worked at. The first seat belts were not invented for a vehicle at all, but for tourists, painters, firemen, or anyone who worked in a job where they might need to be held safely. ![]()
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