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Catalyst: What does trajectory mean? How is it used?

Catalyst: What does trajectory mean? How is it used?. Wind shield. Distance along path of bullet to window, 23.9”. Path of bullet. x. y. 60 feet. Horizon. Distance along horizon to window, 23.5”. Trajectory.

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Catalyst: What does trajectory mean? How is it used?

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  1. Catalyst:What does trajectory mean? How is it used?

  2. Wind shield Distance along path of bullet to window, 23.9” Path of bullet x y 60 feet Horizon Distance along horizon to window, 23.5” Trajectory • Two reference points are needed to define the trajectory of the bullet – the PATH the bullet travels. Forensic Science: Fundamentals & Investigations, Chapter 17

  3. Trajectory • Reference points can be bullet holes in objects or victims. • An entry point and exit point on a victim can be used. • Gunshot residue or spent cartridge casings can be less specific reference points. • Investigators can use lasers to trace a straight-line path to help determine the position of the shooter. Forensic Science: Fundamentals & Investigations, Chapter 17

  4. Wind shield Distance along path of bullet to window, 23.9” Path of bullet x y 60 feet Horizon Distance along horizon to window, 23.5” Calculating Trajectory (Quick & Dirty Similar Triangle Method) Given & Known Information: • Building is 60ft (720 inches away) • Distance from window to bullet entrance is 23.9in. • Horizontal distance from window to bullet entrance is 23.5in. Forensic Science: Fundamentals & Investigations, Chapter 17

  5. Q&DSTM What is distance from shooter to bullet entrance? (c) Distance along path of bullet to window, 23.9” What is the height of the shooter? (b) Distance along horizon to window, 23.5” Building 720” away.

  6. Q&DSTM 23.9” = c . 23.5” 720” What is distance from shooter to bullet entrance? (c) Distance along path of bullet to window, 23.9” Distance along horizon to window, 23.5” Building 720” away.

  7. Q&DSTM 720” x 23.9” = c 23.5” What is distance from shooter to bullet entrance? (c) Distance along path of bullet to window, 23.9” Distance along horizon to window, 23.5” Building 720” away.

  8. Q&DSTM What is distance from shooter to bullet entrance? 732.3” Distance along path of bullet to window, 23.9” What is the height of the shooter? (b) Distance along horizon to window, 23.5” Building 720” away.

  9. Q&DSTM Pythagorean theorem! a2 + b2 = c2 What is distance from shooter to bullet entrance? 732.3” Distance along path of bullet to window, 23.9” What is the height of the shooter? (b) Distance along horizon to window, 23.5” Building 720” away.

  10. (732.3”)2 = (720”)2 + b2 • 536300 = 518400 + b2 • 536300 – 518400 = b2 • 17900 = b2 • 133” = b Q&DSTM What is distance from shooter to bullet entrance? 732.3” Distance along path of bullet to window, 23.9” What is the height of the shooter? (b) Distance along horizon to window, 23.5” Building 720” away.

  11. Practice Q&DSTM Trajectory • Do the practice problems on the trajectory worksheet. • Be sure to put all given information & show your work (SHOW YOUR TRIANGLES).

  12. Trajectory and Projectile Motion • In groups brainstorm some ideas about this trajectory method:- How is the trajectory method used pretty accurate?- Where does the trajectory method breakdown? (where does it have problems)

  13. Bullet Wounds • Why do entrance wounds tend to be smaller than exit wounds? • If the bullet penetrates clothing, what can fibers embedded in the wound indicate? • Where is gunshot residue usually found? • If the gun is fired with the muzzle touching the victim’s skin, what telltale mark may show up? • Will larger or will smaller caliber bullets tend to lodge within the body rather than passing through? Why? Forensic Science: Fundamentals & Investigations, Chapter 17

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