Car Safety
Car safety is something which is extremely important because the roads which we drive on are much more dangerous than we think. You might think you are a safe driver, and maybe you are, but how about other drivers? Each and everyday, hundreds of thousands of cars are on our roads making the chances of a car accident very likely. That is why car safety is so crucial. You might think such an important thing as car safety should be mandatory, well it is now, but 50 or so years ago, seat belts, airbags and front/rear crumple zones were not. Seatbelts were first thought of in the 1930's by US physicians and only in the 1950's did countries require newly built cars to have seatbelts fitted and finally in 1969, 3-point seat belts were mandatory in Australia. The reason why we have seat belts are simple. They keep us from hitting the interior of the car, flying head-first into the windscreen or even smashing through the windscreen in the event of car crash or if it comes to an instant stop. You might say 'wouldn't we stop as the car stops?' Well, according to Newton's First Law of Motion, The Law of Inertia, that's not the case. Inertia is an object's tendency to keep on doing what it is doing/moving and at its speed un
By reducing the force, it also reduces the likelihood of injury. Airbags acts as the unbalanced force acting against the head to stop it from jolting forward (1st Law/Law of Inertia), it also reduces the force by prolonging the time interval (2nd Law and impulse) and because the force is reduced, the equal and opposite force exerted will be less (3rd Law). The airbag works by a sensor, which detects whether a crash occurred by sensing a collision force of 16 to 24km/hr. As the car crashes or comes to an abrupt stop, the person will still continue to move at 60km/hr making the person collide into the windscreen or straight through it! That's why a seatbelt is so important because the seat belt is the unbalanced external force acting against the forward motion. As the car crashes or rapidly stops, the person(s) inside will have the tendency of being jolted forward but at the same time there will be the seatbelt which will jolt it back against the seat. (They share the same motion)Now here is where Newton's 3rd Law of Motion plays a part; 'if body A exerts a force on body B, then body B exerts an equal but opposite force on body A'. Physics can be found in so many everyday uses yet it is rarely noticed but its applications and uses are broad, diverse and important. The person(s) inside the vehicle has a mass and it is also travelling at a certain speed, thus they must also have a force. Crumple zones are areas of the front and rear of the car that is easily collapsible. This is so because car safety is mainly dependant upon physics, especially Newton's Laws of Motion. Now, let's say the car is moving at 60km/hr; therefore the person(s) within the car are also moving at 60km/hr. Crumple zones also works according to Newton's Laws. mv-mu is the 'change in momentum', but momentum will always stay the same. Well the seatbelt is that unbalanced external force. The 3 features of car safety mentioned above can only work if they all work together as one.
Common topics in this essay:
Law/Law Inertia,
Law Motion,
A' Body,
,
Motion Seatbelts,
Conclusion Car,
Law Inertia,
War II,
Newton's Laws,
car safety,
Motion Physics,
crumple zones,
2nd law,
equal opposite,
newton's 2nd,
opposite force,
equal opposite force,
newton's 2nd law,
front rear,
3rd law,
unbalanced external force,
persons inside,
inside vehicle,
2nd law impulse,
equals mass final,
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