In a collision, you have three or four sub-collisions all taking place in sequence. First, the vehicle hits some object. The vehicle abruptly slows, but unrestrained objects inside it continue at the same speed, in the same direction. Then the unrestrained body hits the interior of the vehicle, and starts to slow. That’s the second collision. That body’s internal organs are still moving at speed until they hit the inside of the chest (or get cheese-sliced by their supporting ligaments—and that’s where you get things like bisected livers or aortas). The fourth collision is when the bowling ball you left on the rear deck hits you in the back of the head, because that continued at the same speed in the same direction. Newtonian physics: Learn it, live it, love it.Just so you know at some point during the spring and summer we will be doing spot enforcement checks of seat belts along with seat belt awareness campaigns.
Currently training for the Chicago Marathon in October 2015. Enjoy my running diary. Sidenote:I was the first mayor in the United states to write an everyday blog, although I am no longer a mayor this is that blog.
Wednesday, May 2, 2007
Why you should wear your seatbelt!
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