There is one argument people keep bringing up that you keep ignoring: The danger you are to others.
Let's do some simple maths to comment on the video linked earlier :
Assume the boy weight 70kg (~154 pounds). A standard adult.
Assume the car drives at 50km/h (~31 mph), which is around 14 meter per second. The maximum speed allowed in town in most western europe.
The Kinetic energy the boys has when the car stops brutally is : 1/2 * mass * speed²
So in this case : 1/2 * 70 * 14 *14 = 6860 Joule
This energy is equivalent to a mass of 700 kg (~1543 lbs) falling from a distance of 1m (~39 inches).
So the impact this boy has on his mother is roughly the same as if a cow fell on her neck from 39 inches. A neck would definitely not be strong enough. By not fastening his seat belt, he is a danger to the person sitting in front of him.
A standard windshield would obviously break, too, so this guy is also a danger to persons around.
Notice that the energy is linked to the square of the speed. These values are correct if the car crashes against a solid, immoveable object. If you double the speed, the energy would be 4 times as much.
So on a highway (if I remember correctly, american highways are limited at around 65 mph), it would be like a BIG truc falling on your neck.
Let's now imagine a frontal crash between 2 cars, face to face ...
Let's do some simple maths to comment on the video linked earlier :
Assume the boy weight 70kg (~154 pounds). A standard adult.
Assume the car drives at 50km/h (~31 mph), which is around 14 meter per second. The maximum speed allowed in town in most western europe.
The Kinetic energy the boys has when the car stops brutally is : 1/2 * mass * speed²
So in this case : 1/2 * 70 * 14 *14 = 6860 Joule
This energy is equivalent to a mass of 700 kg (~1543 lbs) falling from a distance of 1m (~39 inches).
So the impact this boy has on his mother is roughly the same as if a cow fell on her neck from 39 inches. A neck would definitely not be strong enough. By not fastening his seat belt, he is a danger to the person sitting in front of him.
A standard windshield would obviously break, too, so this guy is also a danger to persons around.
Notice that the energy is linked to the square of the speed. These values are correct if the car crashes against a solid, immoveable object. If you double the speed, the energy would be 4 times as much.
So on a highway (if I remember correctly, american highways are limited at around 65 mph), it would be like a BIG truc falling on your neck.
Let's now imagine a frontal crash between 2 cars, face to face ...