Examine the diagrams below that show a side view of a window
both before and after impact. Determine the point of impact and
direction of force. Draw an arrow indicating the direction in which
the force was applied to the window.
2. Tempered glass is
also known as safety glass. One of the main uses of this type of
glass is for car windshields. When impacted, safety glass fractures
differently than window glass. Analyze the pictures of safety and
window glass below.
Record some of the differences you observed between the two
types of glass.
Explain how safety glass is better suited for windshield
glass than window glass.
3. Police responded
to an incident involving gunshots. When they arrived at the scene,
they found two men arguing. One man named Henry was inside the
home, and the other man, Ralph, was outside near a shed. Two
bullets went through the large living room window. The police did
not recover the bullets. Henry claimed that he was firing in
self-defense and that Ralph had fired the first shot, noted by A in
the diagram below. In self-defense, Henry shot the second bullet
from inside the house, noted by letter B in the diagram. Ralph
claimed that he did not fire any guns and that the man in the house
fired both bullets at him. As an expert in glass analysis, you have
been called upon to determine what happened.
a. On diagram B, label the radial and concentric fracture lines.
Explain your answer.
b. Based on the fracture lines, which impact A or B occurred
first? Explain your answer.
c. As the expert in glass, you told the police that if you could
examine the actual broken glass, it would be possible for you to
determine the direction in which the bullets were fired. You
explain that it is possible to determine if they were fired from
inside or outside the house. Explain two different methods to
determine the direction of the bullets based on glass analysis.
d. If you examined the actual glass,
could you determine who was telling the truth: Henry or Ralph?
Explain your answer.
5. Examine the diagram of the glass fracture patterns
below. Three different impacts resulted in
the breaking of the glass. Which impact occurred first, second, and
third? Justify your answer in writing and circling evidence seen in
the diagram.
6. Review the diagram below showing
four different impacts from four different rocks.
What is the sequence?
b. Justify your answer in writing and circling
evidence seen in the diagram.
Review the diagram below showing five
different impacts from four different bullets.
What is the sequence?
b. Justify your answer in writing and circling
evidence seen in the diagram.