OT Car crash Physics...

[JoshuaA.Conner@VerizonWireless.com (JoshuaA.Conner@VerizonWireless.com)]

What is the make on that yamaha? FZR400?  360Lbs with oil, gas and liqiud
cooling?  

Joshua Conner
Customer Care
Verizon Wireless
Dublin, Ohio
CoolJ@Vtext.com


-----Original Message-----
From: Jason Adams [mailto:roclist@accessconsulting.ca]
Sent: Monday, October 28, 2002 5:34 PM
To: 0sciroccolist; Jason; Scirocco-Al
Subject: Re: OT Car crash Physics...


M1 is Jaguar XJS curb weight 4808lbs driver 165lbs ---> 2260kg
M2 is Yamaha Motorcycle 360lbs + 125lbs ----->220kg

Jaguar is stationary (waiting to turn left) and is struck by motorcycle
headlong in the pass front fender.

Front of car is displaced 8 feet (2.44m) back remains stationary, wheelbase
is 102" (2.59m)

uK is a coefficient I found on the net.

I want to calculate the inital velocity of the motorcycle.

and no the motorcycle driver isn't doing so well....



Jason Adams
Fahrvergnugen Forever! ;)
84 rocco 16v
93 320i
98 Z71



----- Original Message -----
From: "Jason" <jason@scirocco.org>
To: "Jason Adams" <roclist@accessconsulting.ca>; "0sciroccolist"
<scirocco-l@scirocco.org>
Sent: Monday, October 28, 2002 1:42 PM
Subject: Re: OT Car crash Physics...


> At 03:57 PM 10/28/2002, Jason Adams wrote:
> >With all the wealth of informed people on the list this shouldn't be too
> >difficult...
> >
> >If I know the weight of the cars, the skid distance, assume complete
> >inelastic collision. how do I work it out...
>
> I'm confused here -- what are you trying to work out?
>
> >Vf^2 = Vo^2 + 2a(dS)
> >
> >is there something wrong with my assumption for 'a' ?
>
> Well, uK isn't a constant... the value you use is a "typical" value.
Every
> tire is different, as is every road surface.  And stopping distances on a
> car aren't that easy to compute -- you're dealing with 4 tires on an
object
> that has suspension and that does not have even weight distribution.
>
> "Typical" deceleration for a modern automobile is between 8.5 and 10
> ms^-2.   Of course, some are far below, and a few are above.
>
> Using the 3 braking distance figures I have for the 16V from magazines
(60,
> 80mph from Road & Track, 70mph from Car & Driver), we can compute the
> average a for the 16v's braking:
>
> 60mph   150 feet        7.87g
> 70mph   196 feet        8.19g
> 80mph   257 feet        8.16g
>
> The average of those 3 stops is 8.08g.  The 8V (158 feet from 60, 271 feet
> from 80), averaged 7.61g.
>
> Of course, modern tires and brake pads improve those distances:  Two years
> ago I did 10 consecutive stops from 60 in my16V with Potenza RE71 tires
and
> Ferodo pads and used my G-Tech Pro to measure the distance.  I discarded 3
> runs where the G-Tech did not provide an accurate reading, which left me
> with 7 good runs.  I discarded the best and the worst runs, leaving 5
> total.  The average of those 5 runs was 131.8 feet, which is an average of
> 8.95g.
>
> Jason
>
>
>
>
>
>
>


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