RE: [DML] Re: crash tests / safety

["Cameron, Peter" <cameron@xxxxxxx>]

just FYI Mike,  I work at Brookhaven Lab, my job title is 'senior physicist'. grins.



From: Cameron, Peter
Sent: Tue 11/7/2006 11:33 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: RE: [DML] Re: crash tests / safety


*****  Moderator's Note  *****
The trouble with physicists is there is never one 
around when you need one.  Until we can find one
or somebody finds their college physics text and
looks up the equations, consider this thread 
closed.

*****  Mike G  Moderator of the week  *****


these are not the 'engineering facts', as any engineer (or physicist) will tell you. 

Whether the car is stopped by an immovable barrier or a car of equal mass travelling with equal but opposite velocity, the deceleration will be the same. The car will transition from being in motion at a constant velocity to a dead stop in the same distance. To repeat, the deceleration will be the same. The deceleration (number of g's) is the killer. 

apropos this, isn't it about time for the moderators to kill this thread?



From: dmc12rb
Sent: Tue 11/7/2006 9:46 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: crash tests / safety


We have seen a fair amount of discussions on this subject, but many 
of them are opinions and presumed logic. 

The engineering facts are:

A "barrier test" and a head-on collisions in this argument are 
fundamentally different. While in both instances the vehicle(s) will 
theoretically stop upon collision (assuming equal masses in the case 
of a head-on), the crash speed is cumulative. IE: if barrier = 40 
mph, head-on = 80 mph = 40 mph + 40 mph. 


[moderator snip]



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