Fiber Properties and Forensic Evidence

Questions and Answers

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.

True

Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.

False

Polyester has properties similar to nylon except it is easily broken down by light and concentrated acid.

False

A disadvantage of manufactured fibers is that they can deteriorate in bright sunlight and melt at a lower temperature than natural fibers.

True Signup and view all the answers

Fibers are woven into textiles or fabrics.

True Signup and view all the answers

Evidence at a crime scene, like those in our recent case of the Bicycle accident, is easily identified and collected.

False Signup and view all the answers

In the case of the Missing Sister, the victim was a cashier at a bank.

False Signup and view all the answers

The murderer in the Missing Sister case was likely hiding the woman's disappearance.

True Signup and view all the answers

The transfer of evidence such as a fiber from a source to a person, then to another person, is called:

secondary transfer Signup and view all the answers

The cell phone of the victim was found at the scene.

False Signup and view all the answers

Fibers that have been spun together are called:

yarn Signup and view all the answers

A small molecule that may bond to other monomers to become a polymer is called a:

monomer Signup and view all the answers

The time from finding the body and the last time the victim was seen was 5 months.

False Signup and view all the answers

When fibers are transferred directly from victim to suspect or suspect to victim, this is called:

direct transfer Signup and view all the answers

Fiberglass is a fiber form of:

glass Signup and view all the answers

Half the fibers produced today are synthetic. They are categorized as:

regenerated fibers and polymers Signup and view all the answers

Within 24 hours, an estimated ____ of all fibers may have fallen from a victim or been lost from a crime scene.

95% Signup and view all the answers

Two methods that can analyze fibers without damaging them are:

polarizing light microscopy and infrared spectroscopy Signup and view all the answers

Weave patterns have names like tabby, twill and:

satin Signup and view all the answers

The number of threads that are packed together for any given amount of fabric is known as ____________________.

thread count Signup and view all the answers

Fibers are classified as either:

natural fibers or synthetic fibers Signup and view all the answers

All plant fibers share the common polymer that is:

cellulose Signup and view all the answers

One seed fiber is:

cotton Signup and view all the answers

One stem fiber is:

hemp Signup and view all the answers

______________ is the most common stem fiber, and is most commonly found in the textile, linen.

flax Signup and view all the answers

Which of the following was a faked name in the case of the Missing Sister?

Owen Bennett Jones Signup and view all the answers

Monica Miller, the driver in the Bicycle Accident case was identified because:

her fingerprints were in AFIS Signup and view all the answers

A forensic scientist will ask questions about:

type of fiber, number of fibers found, fiber color, where the fiber was found, textile from which fiber originated Signup and view all the answers

The simplest weave pattern is the plain, or __________________, weave.

tabby Signup and view all the answers

Natural plant fibers are produced from:

seeds, leaves, fruits, stems Signup and view all the answers

Fiber evidence is gathered with:

vacuums, forceps, glue, lint roller or tape Signup and view all the answers

Natural fibers come from:

plants, animals, minerals that are mined from the ground Signup and view all the answers

The important evidence found at the bicycle accident was:

2010 Miata mirror, blood Signup and view all the answers

The most important evidence in the Missing Sister case was:

hair and fibers found on the body, banking and account records Signup and view all the answers

The crime(s) in the Missing Sister case were:

Financial fraud, Murder Signup and view all the answers

Study Notes

Fiber Types and Properties

Rayon is the most common regenerated fiber, derived from cellulose with a plant origin.
Synthetic polymer fibers originate solely from petroleum products.
Polyester possesses distinct properties compared to nylon; it is less affected by light and concentrated acid.
Manufactured fibers have a disadvantage of deteriorating in bright sunlight and melting at lower temperatures than natural fibers.
Fibers are the fundamental components in the creation of textiles or fabrics.

Evidence Collection in Forensics

Crime scene evidence, such as fibers, may not always be easily identified and collected.
Early fiber collection is crucial; within 24 hours, an estimated 95% of fibers may be lost from a victim or crime scene.
Fiber analysis can be performed using non-destructive methods like polarizing light microscopy and infrared spectroscopy.

Fiber Properties and Composition

Fibers spun together form yarn, while small molecules that bond to form polymers are called monomers.
Fibers are classified into natural or synthetic categories.
Common polymers for plant fibers include cellulose, which is found in all plant-based fibers.
Examples of seed fibers include cotton; examples of stem fibers include hemp and flax.

Case Studies Recap

In the Missing Sister case, the murderer likely attempted to conceal the woman's disappearance.
A fake name involved in the Missing Sister case was "Owen Bennett Jones."
Monica Miller, involved in the Bicycle Accident case, was identified through fingerprints in AFIS.
Key evidence from the bicycle accident included a 2010 Miata mirror and blood, while crucial evidence from the Missing Sister case comprised hair and fibers on the victim and banking records.

Weaving Techniques and Measurements

Weaving patterns include tabby, twill, and satin.
Thread count measures the density of threads in a given fabric area.
The simplest weave pattern is the plain or tabby weave.

Natural Fiber Sources

Natural plant fibers derive from seeds, leaves, fruits, and stems.
Natural fibers can originate from plants, animals, and minerals derived from the ground.

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Description

Explore the world of fibers in textiles and their crucial role in forensic science. This quiz covers the types of fibers, their properties, and the importance of evidence collection in crime scenes. Test your knowledge on how fibers affect both fabric production and forensic investigations.

Fiber Properties and Forensic Evidence

Questions and Answers

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.

Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.

Polyester has properties similar to nylon except it is easily broken down by light and concentrated acid.

A disadvantage of manufactured fibers is that they can deteriorate in bright sunlight and melt at a lower temperature than natural fibers.

Fibers are woven into textiles or fabrics.

Evidence at a crime scene, like those in our recent case of the Bicycle accident, is easily identified and collected.

In the case of the Missing Sister, the victim was a cashier at a bank.

The murderer in the Missing Sister case was likely hiding the woman's disappearance.

The transfer of evidence such as a fiber from a source to a person, then to another person, is called:

The cell phone of the victim was found at the scene.

Fibers that have been spun together are called:

A small molecule that may bond to other monomers to become a polymer is called a:

The time from finding the body and the last time the victim was seen was 5 months.

When fibers are transferred directly from victim to suspect or suspect to victim, this is called:

Fiberglass is a fiber form of:

Half the fibers produced today are synthetic. They are categorized as:

Within 24 hours, an estimated ____ of all fibers may have fallen from a victim or been lost from a crime scene.

Two methods that can analyze fibers without damaging them are:

Weave patterns have names like tabby, twill and:

The number of threads that are packed together for any given amount of fabric is known as ____________________.

Fibers are classified as either:

All plant fibers share the common polymer that is:

One seed fiber is:

One stem fiber is:

______________ is the most common stem fiber, and is most commonly found in the textile, linen.

Which of the following was a faked name in the case of the Missing Sister?

Monica Miller, the driver in the Bicycle Accident case was identified because:

A forensic scientist will ask questions about:

The simplest weave pattern is the plain, or __________________, weave.

Natural plant fibers are produced from:

Fiber evidence is gathered with:

Natural fibers come from:

The important evidence found at the bicycle accident was:

The most important evidence in the Missing Sister case was:

The crime(s) in the Missing Sister case were:

Study Notes

Fiber Types and Properties

Evidence Collection in Forensics

Fiber Properties and Composition

Case Studies Recap

Weaving Techniques and Measurements

Natural Fiber Sources

Studying That Suits You

Description

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