Answer to Question #266985 in Mechanics | Relativity for Roberto Bernardez

Question

Vehicles like cars, trucks and jeepneys have seatbelt to be used by the driver for the safe driving and seats were also have head rest. What is the importance of these safety features found in the vehicles? Apply the first law of your answer

Answer 1

If a car is moving and then suddenly runs into something, like a wall or another car, that thing acts as an unbalanced force that stops the car abruptly. Since seat belts are part of the car, anyone in the car will also have their motion stopped abruptly if they're wearing a seat belt. A seat belt that's buckled snugly helps you to share the same state of motion as the car. When the car goes faster, the people also go faster, but when the car goes slower, the seat belts hold the people against their seats, helping them to also go slower.

If people don't wear seat belts, they aren't held in place in the car, so they can move on their own instead of sharing the car's motion. This means that if the car is suddenly in a crash, the car will stop, but the people inside will keep moving forward until they hit something that stops them. That something can be the seat in front of you or the dashboard of the car. If the crash is violent enough, the people inside can even keep going through a window, not stopping until they hit the ground or another solid object outside. When this happens, they are seriously hurt, sometimes badly enough to die.