Physics and Forensics-Projectile Motion

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SUMMARY

The discussion focuses on the application of projectile motion concepts in forensic science, particularly in determining the origin of gunfire. Key areas of application include ballistics, blood splatter analysis, and auto accident recreation. Ballistics is defined as the study of projectiles, emphasizing the importance of understanding bullet speed and trajectory, which can be derived from manufacturer data or empirical testing. The conversation highlights the relevance of these concepts in various forensic scenarios, including crime scene reconstruction and accident analysis.

PREREQUISITES
  • Understanding of ballistics and its relation to projectile motion
  • Familiarity with forensic science principles
  • Knowledge of blood spatter analysis techniques
  • Basic physics concepts related to motion and trajectory
NEXT STEPS
  • Research the principles of forensic ballistics and bullet trajectory analysis
  • Study blood spatter pattern analysis techniques in forensic investigations
  • Explore methods for reconstructing auto accidents using physics
  • Learn about the physics of projectile motion in crime scene analysis
USEFUL FOR

This discussion is beneficial for forensic scientists, crime scene investigators, and anyone interested in the intersection of physics and forensic analysis, particularly in the context of ballistics and accident reconstruction.

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Is it possible to use the concepts of projectile motion and etc. in forensics while trying to find out the area from which a gun was fired.

How else do the concepts of projectile motion apply to forensics?
From my research, I came up with Blood Splatter, Ballistics and Auto Accident Recreation.

Does the word ballistics apply to projectile motion? How can I use projectile motion in forensics?

I appreciate the help!
 
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Welcome to PF!

colourstrips said:
Does the word ballistics apply to projectile motion? How can I use projectile motion in forensics?

Hi colourstrips! Welcome to PF! :smile:

Ballistics is the study of projectiles, which are objects which travel through the air with no help other than an initial impulse (shove!)
Is it possible to use the concepts of projectile motion and etc. in forensics while trying to find out the area from which a gun was fired.

I'm just guessing, but judging from programmes like CSI, the distances are usually so short that you can assume the bullet travels in a straight line.

For much longer distances, you would need to know the speed of the bullet as it leaves the gun, which you should be able to get from manufacturer's data, or from testing the gun itself.
How else do the concepts of projectile motion apply to forensics?
From my research, I came up with Blood Splatter, Ballistics and Auto Accident Recreation.

Blood Spatter … no, that would be from experiments, not from theoretical calculation.

Auto Accident Recreation? Ballistic motion won't apply unless one of the vehicles becomes airborne! :wink:
 
Don't forget how far a body may fall from a building, whether pushed or slipped from a ledge.

And as to a car accident, with no seat belts ... or figuring where the little old lady's walker ended in a tree ...

Or how far from the bridge a gun used in a homicide may have landed in the water ...

Or shell casings ejected from a weapon ...
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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