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Topic: Deceleration
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| Monday, November 4, 2002 |
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EFFECT OF GRADE ON KINETIC FRICTION IN ACCIDENT RECONSTRUCTION
Copyright (C) George M Bonnett, J.D. 1992
All rights reserved.
ABSTRACT
This paper details a method of adjusting the drag factor of a vehicle when there is a difference of grade between the tested surface and the actual accident surface. This method is based on the sum of the forces acting on the object and is accurate for any grade. The popular method used by most accident reconstructionists consists of adding the signed difference in grade to the test drag factor. Many reconstructionists believe that the adjusted drag factor obtained by this second method is relatively accurate only for grades of ten percent (.1) or less.
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Posted by: george bonnett on 11/4/2002 @ 03:35 PM
Amended: 11/4/2002
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| Friday, October 18, 2002 |
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Braking Skid Test June 2002 Surface- Level Steel Grate Bridge Surface Vehicle: 1998 Dodge Ram 1500 Quad Pickup Temperature: mid 70's; partly cloudy Instrumentation: VC2000 and Drag Sled
Drag Sled: 30 pounds 2 Pulls: 22# and 25# Results: .73 and .83
Truck Braking Run1: 37 MPH/ .84 ave (.94 peak) Run2: 36 MPH/ .83 ave (.90 peak)
View Attachment 1: Braking Skid Test on Steel Grate
View Attachment 2: Steel Grate Photo
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Posted by: Stephan Neese on 10/18/2002 @ 01:50 PM
Amended: 10/18/2002
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