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Blood Drop Lab Activity

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Dawn C.


Hazel Green High School, Madison County Schools


This podcast was created to outline a lab activity on the analysis of blood droplets that can be utilized in the forensic science classroom.  The video contains footage from a high school classroom.  Students perform drops at varying heights to first determine the effect height has on the diameter of the drops.  The teacher then demonstrates the correct lab technique for performing drops at set angles. After performing their drops, the student then use the mathematical relationship between the height and width measurements to determine the actual angle of impact.  

Length: 02:57

Content Areas: Science

Alabama Course of Study Alignments and/or Professional Development Standard Alignments:

SC (9-12) Forensic Science Elective
9. Use laws of physics to explain forensic evidence.
  • Analyzing blood splatter patterns in relation to speed, height, and direction
  • Tracking trajectories of collected evidence
    SC2015 (9-12) Physical Science
    7. Analyze and interpret data for one- and two-dimensional motion applying basic concepts of distance, displacement, speed, velocity, and acceleration (e.g., velocity versus time graphs, displacement versus time graphs, acceleration versus time graphs).
    SC2015 (9-12) Physical Science
    8. Apply Newton's laws to predict the resulting motion of a system by constructing force diagrams that identify the external forces acting on the system, including friction (e.g., a book on a table, an object being pushed across a floor, an accelerating car).
    SC2015 (9-12) Physics
    1. Investigate and analyze, based on evidence obtained through observation or experimental design, the motion of an object using both graphical and mathematical models (e.g., creating or interpreting graphs of position, velocity, and acceleration versus time graphs for one- and two-dimensional motion; solving problems using kinematic equations for the case of constant acceleration) that may include descriptors such as position, distance traveled, displacement, speed, velocity, and acceleration.
    SC2015 (9-12) Physics
    2. Identify external forces in a system and apply Newton's laws graphically by using models such as free-body diagrams to explain how the motion of an object is affected, ranging from simple to complex, and including circular motion.
    a. Use mathematical computations to derive simple equations of motion for various systems using Newton's second law.
    b. Use mathematical computations to explain the nature of forces (e.g., tension, friction, normal) related to Newton's second and third laws.


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