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Colm2243
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What formula(s) would I use to find the initial velocity of a vehicle that has impacted a second vehicle in a same direction crash. There are no tire marks on the roadway and no braking involved. Thanks.
I don't have the values for pre collision velocity on either vehicle. How can I determine this? A wall was impacted after the two vehicles became stuck together and after impact with the wall vehicle two separated and rolled over and skid to a stop 40 feet after separation on it' s roof.Moridin said:In physics, there is something called translation symmetry, meaning that the fundamental properties of the Universe does not depend on where you are. Out of this symmetry, a phenomena known as momentum arises. In non-relativistic velocities, this is a good approximation.
From your post, I assume that the first car (called car A) hits the second car (car B) from behind. No matter if some kinetic energy is converted to heat energy via friction, the sum of the momentum for car A and the momentum of car B before the impact is the same as the sum of the momentum for car A and the momentum for car B after the impact.
[tex]m_{A(before)} v_{A(before)} ~+~ m_{B(before)}v_{B(before)}~ = m_{A(after)} v_{A(after)} ~+~ m_{B(after)} v_{B(after)}[/tex]
Solve for the velocity for A before the crash if you have access to the other values.
Translation symmetry only exists in the Newtonian limit?!?Moridin said:In non-relativistic velocities, this is a good approximation.
Crash reconstruction is the process of analyzing and interpreting evidence from a motor vehicle accident to determine the sequence of events leading up to the crash. It is important because it can provide valuable information for legal and insurance purposes, as well as help prevent similar accidents in the future.
Evidence used in crash reconstruction can include physical evidence from the scene of the accident such as tire marks, vehicle damage, and debris, as well as witness statements, police reports, and data from event data recorders.
The speed of vehicles involved in a crash can be determined through various methods, such as analyzing skid marks, calculating the coefficient of friction, and using mathematical equations based on the distance traveled and the time it took for the crash to occur.
Yes, crash reconstruction techniques can be applied to any type of motor vehicle accident, including car, truck, motorcycle, and pedestrian accidents.
The accuracy of crash reconstruction depends on the available evidence and the expertise of the reconstructionist. With careful analysis and the use of advanced technology, crash reconstruction can provide a high level of accuracy in determining the factors and events leading up to a motor vehicle accident.