Page 5 - 瑪利諾神父教會學校2020年

Blood Spatter–

Be a Crime Scene

Investigator

Maryknoll Fathers' School

Maryknoll Fathers’ School designed Blood Spatter
– Be a Crime Scene Investigator as a cross-curricular
STEM activity for F.3 students.
Forensic Science is the theme of Blood Spatter.
During the activity, students acting as crime scene
investigators were asked to examine the injured body
with bloodstains on the floor. With the knowledge
acquired in Biology, Computer Literacy and Mathematics 《法證先鋒》 Blood Spatter
classes, students were required to solve the crime.
Aiming at consolidating knowledge acquired, this activity requires students to integrate knowledge in
several subjects and apply it in a designed setting. As Maryknoll Fathers’ School is a catholic secondary
school, elements in Ethics and Religious Studies are included to demonstrate the relationship between
Science and Religion with students.
Learning focus:

Students scanned the QR code to obtain information on the relationship between
Biology
plasma, blood cells and DNA before class. Teachers would then explain further in class.
Computer
Literacy Students wrote a mobile App to calculate trigonometric function (sine) in the activity.
Students learnt about trigonometric function. They were required to find out the angle of
Mathematics
the spattering of blood by sine ratio in order to identify the point of injury.
Ethics and Students were introduced to the “Complementarity Theory” and “Conflict Theory”. They
Religious also had discussion on the relationship between religion and science and explored
Studies whether science should be applied in Church.
Creativity Students demonstrated their creativity and performed the events during the “criminal
design activity”.

Content:

During the activity, students were required to measure the
size of bloodstains left in the simulated murder scene and use
the mobile App created in Computer Literacy class, together
with the concept of sine ratio, to calculate the angle at which the
blood spattered. Then, they were required to set the projection
lines with cotton threads and protractors according to the
calculated angle, and to use the laser distance meter to find the injured coordinates. After that, they used
a laser distance meter to measure the distances between each bloodstain and the wall. These data would
be input to the excel formula designed by teachers to generate the injured coordinates. Students had to
compare the coordinates generated by the above two means and understand the difference between idea
data and actual experiment.
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