The Traffic Accident Reconstruction Origin -ARnews-

Re: Chain reaction accident

Paul R ([email protected])
Sat, 19 Dec 1998 17:33:16 -0500 (EST)

To clarify, the reason I used this equation, is because this is the equation that an IPTM instructor used in an example of a motorcycle striking a parked vehicle. The instructor stated that this is also the equation he uses for chain reaction highway accidents.
The example had marks from a sliding wheel of the car, because it was in park. In my situation, all I have is rolling resistance, there are "NO" skids. The instructor never showed crush as a way of determining speeds, because he said it was unreliable. Anyway, here was how the example was used.
3800*24*.76=we The 3800 was the weight of the struck vehicle. the 24 was the distance in feet that the vehicle was pushed. and the .76 is the f.
(we) was then multiplied by 64.4, and then divided by 600 (the weight of the motorcycle). Then that result was square rooted for velocity. So it was only square rooted once. But in my real life situation, the impact speeds seem to low for the damage. Also, in the above given example, wouldn't I multiply .76 by .35? .20 for the locked wheel of the parked car, and the .5 for each additional wheel for rolling resistance? That would make my f even lower, and an even slower speed than i've been coming up with. By the way, i'm very thankful for the imediate response to this question. All thoughts on this are welcome. Who knows, maybe someone else will get something out of this too.
Paul R
[email protected]

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