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The seatbelt is a long strip of re-enforced nylon duct that is wound at the top by a speed-lock ratchet... At slow speeds it releases and allows the belt to be extended to a length where it can be locked next to the base of the seat... However, at a fairly high speed it locks (Very firmly) from the inertia of the speed ratchet.. Therefore, in extreme conditions when the belt is in use (and it should be whenEver the car is Driven) the result of a sudden stop by the vehicle is the passenger or driver thrown forward at speed aGainst the Seatbelt; Causing the ratchet to lock and prevent injury to the user... In other words, it is the FIRST Line of Defence against high-impact / accident Sudden-halting.. EnGage your SeatBelt BEFORE any Driving is underway as The Majority of Accidents take place in the First 10 Minutes of the Journey! It is a Scientifically-PROVEN Lifesaver and just USE THEM! Whenever Starting Up!
In answer to your question.The role that science plays is in kinematics, the science of moving objects.The principle force will be that of Inertia. The tendency for an object to maintain its velocity and vector.
As the car is moving, so are you (obviously). But when the car stops suddenly, your inertia will want you to carry on at the same speed.
Relying only on the friction of the seat of your pants is not good enough. The belt attaches you to the vehicle firmly. So when the car stops, so do you, instead of carrying on through the windscreen.
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