Matching Tire Tracks Worksheet Answers

Aim : How do scientists analyze tire tracks?Tire track impressions are retained on surfaces in two- and three-dimensional forms. Almost all impressions, including fractional impressions, have value for forensic comparisons. In this lesson, students learn how to analyze tire tracks.

Objectives of the Lesson:

Students will exist able to:

one) sympathise which aspects of tire tracks can be analyzed.

 2) explain how tire tracks can exist individualized.

Motivation:  Distribute an image of a tiretrack and discuss what aspects of the tire might have probative value.

Content of the Lesson: Show a PowerPoint presentation to review characteristics of  tire track analysis.

Tire impressions reverberate the tread design and dimensional features of the private tires on a vehicle. If properly collected the tire tread impression is extremely valuable in proving a suspect vehicle was present at a crime scene. Tire runway evidence tin can:

• Positively lucifer a suspect vehicle
• Determine the wheelbase or turning bore of a vehicle
• Provide information to place the blazon or size of vehicle in question
• Help identify or eliminate a doubtable vehicle
• Show secondary transfer data usable in crime reconstruction

Activities:

1. Have students identify accidentals on the tire rails image previously distributed.

2. Distribute a sample Tire Track Exam worksheet used past forensic analysts and discuss what other aspects of tires can be analyzed.

3. Distribute a Rail Measurement  woksheet and have students measure out the width of the  tire tracks using a metric ruler.

Background:

Tires are fabricated of semi-hard rubber and are characterized by course and individual characteristics. Class characteristics include size and general patterns. Private characteristics include regular wear and tear equally well as accidental cuts or holes. These characteristics may be reproduced in the tracks left by the tire, depending on the surface and the circumstances under which the track occurred.

When tire tracks are present at a crime scene or in the immediate vicinity, one must properly find and record them. Starting time, they need to be photographed at a ninety-degree angle. This allows for a permanent tape of their class and individual characteristics. Then, the tracks are carefully measured. Not only it is important to annotation the width, just also the circumference of the tire, if the lengths permit it. In addition, if multiple tire tracks from the dissimilar wheels of the vehicle are nowadays, it is important to brand every bit many measurements as possible in order to determine the toe (the distance between the front of the tires and the rear of the tires on the same axle) and turning radius of the vehicle. Finally, if the tracks are nowadays in relief, it is also possible to make a cast from it. Normally, plaster of Paris is used and, if the whole track cannot exist cast, the most pertinent spot is cast.

Once the general size and pattern of the track is adamant, it is possible to consult a database of tires to determine the brand and model of the tire that left the impression. In improver, at that place are also databases that list which tires are installed from the factory on which vehicles. Finally, with the dimensions of the vehicle, it is also possible to determine which vehicle could accept left the tracks.

Recent advances in applied science and research permit for the label of tire tracks by chemical assay of the rubber. I f a tire leaves rubber residues on the surface, equally is the case with sideslip marks, crime scene investigators can collect these traces and compare them with the tires from a suspected vehicle. The result of this assay is non as powerful equally having individual characteristics that will place the exact tire, but information technology adds i more piece of information to the investigation.

Matching Tire Tracks Worksheet Answers,

Source: https://sites.google.com/site/crimesceneanalysis/tiretracks-1-1

Posted by: brinsonthund1953.blogspot.com

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