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Learning Object
Sequencing Impacts Using Radial and Concentric Fractures (Screencast)
Learners examine radial and concentric fractures in glass to determine the sequence of the impacts.
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Concentric fractures, Glass cracks, Radial fractures, Sequencing impacts
Spatter Drop Dynamics on Impact (Screencast)
In this screencast, the student will learn that regardless of the surface onto which a blood droplet is falling, the angle or velocity at which it does so, or the volume of the droplet, there are four distinct phases involved in the reaction of a moving droplet with impact against a surface.
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police science
Stain Measurement & Calculating Angles of Impact (Screencast)
In this learning object the student will learn how to measure a stain and calculate angles of impact. Determining the angle of impact for bloodstains takes advantage of the trigonometric functions (Sine function).A mathematical relationship exists between the width and length of an elliptical bloodstain which allows for the calculation of the angle of the impact for the original spherical drop of blood.Given well formed stains we can accurately measure the width and length by simply dividing the stain along it’s major and minor axis. The opposite halves would be generally equal to each other which aids in establishing the impact angle.
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calculate, ellip, Mathematical, measurement, Stain
Summary of Bloodstain Evidence Documentation (Screencast)
This activity will summarize the bloodstain evidence documentation process.
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blood