The purpose of this experiment was to see the effects of angle and height on the shape of blood splatter. I hypothesized that as heights and angles are changed the shape of each splatter would change. Simulated blood was created with corn syrup, cornstarch, and food coloring, then put into dropper. The dropper was mounted onto projectile launcher for exact angle measures. With the setup the blood was then dropped in different angles and heights. As each splatter was checked, the shape changed minimally and remained a circular shape. Thus it can be concluded that, angle and height as variables isn’t enough to differentiate the shape of blood splatter.
Test #2
The purpose of this experiment was to see the effects of surface angles on the shape
In Blood In Blood Out is a drama directed by Taylor Hackford, and starring Damian Chapa (Miklo), Benjamin Bratt (Paco), and Jesse Borrego (Cruz), produced by Hollywood Pictures. The film was based off everyday life in East Los Angeles, from the 1970’s through the 1980’s. Damian Chapa stars as Miklo in the film, a Mexican-American who wanted to be accepted, not by his skin but for the Mexican within him. Benjamin Bratt (Paco) was the older cousin of Miklo, who learned his lesson throughout the movie and changed his ways. Jesse Borrego (Cruz) is the step-brother of Paco who was a talent artist, who ended up turning to drugs because of back problems caused by a rival gang incident.
to get an idea of how I would do my real experiment and what apparatus
The idea is to get a sort of background story from the random blood distribution. The different types of blood can tell us the method an assailant uses, such as passive blood stains. These stains are made from the drops of a weapon due to gravity. For instance, if an attacker walked away from stabbing someone, the weapon would leave a series of drops.... ... middle of paper ...
The results of this experiment are shown in the compiled student data in Table 1 below.
Bloodstain Pattern Analysis is a forensic discipline which, among others, the position of victims can be determined at crime scenes on which blood has been shed. To determine where the blood source was, investigators use a straight-line approximation for the trajectory, ignoring effects of gravity, drag and overestimating the height of the source. We determined how accurately the location of the origin can be estimated when including gravity and drag into the trajectory reconstruction. We created eight bloodstain patterns at one meter distance from the wall. The origin’s location was determined for each pattern with: the straight-line approximation, the method includes gravity, and the method we use includes both gravity and drag. The latter
Projected blood spatter, will produce 1.0ml of blood and this is a minimum. A lot of this type of spatter will resemble spine shaped stains that emit from a central area of blood. (James, Kish and Sutton, 2005)
...r than 3 mm in diameter. Medium velocity impact spatter usually produces stains between 1 and 3 mm in diameter and may be caused by blunt force trauma or stabbing actions. High velocity impact spatter stains are usually less than 1 mm in diameter and may be produced by gunshots. Reconstructing a crime scene using medium velocity impact spatter may provide information on directionality, point of convergence, and area of origin. Blood spatter analysis can also be used to corroborate witness testimony as to events at a crime scene. Error associated with BPA includes human error, non-uniform formation and rotational offset. Mr. Roller concluded that BPA experts must remember to testify only to the things that they cannot exclude and that more work should be done to determine a universal method for BPA with consistency between crime scenes and different analysts.
In conclusion, the title and context of the article are clear, and appropriately match the hypothesis of the authors. There is consistency between the objective of the experiment and its relationship to science. This writer found some issues in the overall presentation of information, in that the text lacks smooth transition, and was difficult to read and follow.
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
In order to reconstruct a crime scene, analysis must classify the bloodstain spatter, and there are many way to classify blood stain patterns: bloodstain spatter by velocity and bloodstain through taxonomy. In the classification of the bloodstain spatter by velocity, there are three basic categories of stain groups...
Polman, H., Orobio De Castro, B. & Van Aken, M. A.G. (2008). Experimental Study of the
To investigate the affect the material of a ball has on the bounce height of that ball where the drop height (gravitational potential energy), temperature, location, ball, and air pressure of the ball are kept constant.
There is also the potential of human error within this experiment for example finding the meniscus is important to get an accurate amount using the graduated pipettes and burettes. There is a possibility that at one point in the experiment a chemical was measured inaccurately affecting the results. To resolve this, the experiment should have been repeated three times.
It is also possible to calculate the area of origin of spatters three-dimensionally in the given space. This is dependent on the phase of flight that the blood drops are in. The shape of droplets depends on their angle of impact on a surface. Pictures that show different shapes in the case of different angles oversimplify this question. The difficulty lies not in the mathematical calculation itself, which is a case of trigonometric relationships, but in the selection of which droplets to consider and the differential diagnosis of whether the spatter is calculable or not. Novices in the discipline often make mistakes in this respect.
Blood spatter analysis is the blood evidence examined to draw a conclusion of how the incident may have occurred. This evidence also helps examine the patterns of the blood to see how