Basic Physics: Notes for Traffic Crash Investigators and Reconstructionists : an Introduction for Some, a Review for Others
The purpose of this book is to bring to the student an understanding of the basic physics involved not only in traffic crash investigation and reconstruction but also in crimes or other incidents where the movement of objects or persons is involved. The range of topics included are those considered to be fundamental and which best serve the purposes of illustrating the methods and procedures vital as an introduction to physics. Essentials of the subject as related to vehicle motion are stressed. The mathematics used is kept simple and in straightforward, easy-to-understand language. Comments and examples and a very comprehensive list of terms and definitions, supported by many illustrations and diagrams, are provided to give the reader a unified view of basic physics. All materials are prepared in both the English (U.S.) and metric (S.I.) systems. The text is intended to serve a need for investigators who possess a good knowledge and understanding of elementary algebra and trigonometry, and who have successfully completed at least an at-scene traffic crash investigation course and wish to further their knowledge towards competency in advanced traffic crash investigation and reconstruction.
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MEASUREMENTS IN PHYSICS
GRAVITY MASS AND WEIGHT
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accel acceleration due acceleration factor body calculated center of gravity center of mass centrifugal force centripetal acceleration centripetal force change in velocity circular path coefficient of friction coefficient of restitution collision component curve decimal fraction Usually defined deformation direction displacement distance drag factor due to gravity Earth elastic elastic collision English system equal and opposite example fictitious force Figure fluid force acting force F force of gravity Formula fraction Usually expressed frame of reference friction force ft-lb ft/s impact inertia Institute of Police investigation and reconstruction joules kilogram-force kilograms kinetic energy km/h Law of Motion magnitude manual mass and weight measured Newton's Second Law newtons normal force object physics Police Technology potential energy pound-force pounds pressure radius resultant roadway surface sliding slugs square inch superelevation Symbols tire torque traffic accident investigation traffic crash investigation truck units vehi vehicle traveling vehicle's wheels