Conservation of Linear Momentum Using Vector Sum Analysis

Conservation of Linear Momentum Using Vector Sum Analysis

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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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