Conservation of Linear Momentum Using Vector Sum Analysis
Conservation of Linear Momentum
Using Vector Sum Analysis
by W.A. Kennedy
It is difficult for even the experienced reconstructionist
to visualize the momentum components of colliding vehicles. To conquer this
problem, W. A. Kennedy has drawn a series of “pictures” that present a
graphic solution to the momentum equations.
In this book, the author uses a coordinate system to
graphically illustrate the vector components of the vehicles involved. To
clarify the graph, he uses a distinct color for each vehicle and provides an
explanatory text, complete with the momentum formulas and all of the variables
needed, to solve the problem.
The graphical solutions provide an alternative to formulas
in determining pre-impact and post-impact vehicle speeds. They also provide a
check on the accuracy of computations that use formulas and enable the crash
reconstructionist to gain a clear visual impression of the vector components
present in collisions.
After a brief introduction, Mr. Kennedy addresses the
following topics:
- Post-Collision Scene Data and Trajectory Analysis
Using the Right Hand Coordinate System
- Vectors and Vector Analysis
- Post Impact Analysis
- Pre-Collision Scene Data and Trajectory Analysis
- Pre-Collision Side of Equation
- Post-Collision Data and Trajectory Analysis Using the
Left Hand Coordinate System
Walter A. “Butch” Kennedy served 17 years with the
Jacksonville Sheriff’s Department and was awarded the Medal of Merit for
Bravery in 1983. While there, he was assigned as Academy instructor in crash
investigation and reconstruction and tactical police driving. Mr. Kennedy has
been a member of the faculty at IPTM teaching crash investigation and
reconstruction courses throughout the country.
Specifications: 32 pages; 8½”x11”; Coil bound; Publisher: IPTM (May 1989)
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