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Free-falling Bodies: Example01:05

Free-falling Bodies: Example

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An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
The...
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Free-falling Bodies: Introduction01:07

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All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is...
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Impact: Problem Solving01:26

Impact: Problem Solving

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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
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Collisions in Multiple Dimensions: Problem Solving01:06

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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
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Types of Collisions - II01:19

Types of Collisions - II

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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Conservation of Momentum: Problem Solving01:30

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Solving problems using the conservation of momentum requires four basic steps:
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Updated: Jan 7, 2026

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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Fatality due to falling bullet

Mehmet Tokdemir1,2, Burcu Harmanci1, Merve Temel2

  • 1Department of Forensic Medicine, Faculty of Medicine, Katip Çelebi University, Izmir, Turkey.

Journal of forensic sciences
|December 30, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Falling bullets from gunfire cause unique injuries, often missed in diagnosis. This case highlights the preventable tragedy of a child

Palabras clave:
balísticabala perdidalesión por arma de fuegomedicina forensetraumatismo craneoencefálico pediátricosalud pública

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Área de la Ciencia:

  • Patología Forense; Salud Pública; Balística

Sus antecedentes:

  • Las balas perdidas de disparos de celebración representan un riesgo para la seguridad pública, a menudo presentándose con signos externos sutiles que complican el diagnóstico y la evaluación médico-legal. Estas lesiones afectan de manera desproporcionada a poblaciones vulnerables, incluidos los niños, lo que provoca una mortalidad prevenible y consecuencias sociales significativas.

Objetivo del estudio:

  • Informar sobre un caso fatal de lesión por bala perdida en un bebé. Discutir los mecanismos únicos de lesión de las balas perdidas y su significado médico-legal. Enfatizar la necesidad de intervenciones de salud pública y legales para prevenir tales incidentes.

Principales métodos:

  • Informe de caso de un bebé de 11 meses fallecido por una lesión por bala perdida. Examen externo detallado y hallazgos de la autopsia. Discusión de los principios de balística relacionados con las balas perdidas y su dinámica de impacto.

Principales resultados:

  • El bebé sufrió una fractura deprimida del cráneo y una lesión intracraneal fatal, incluido daño en el bulbo raquídeo, por una bala perdida. El examen externo reveló solo una pequeña herida de entrada, que carecía de los signos típicos de las heridas de bala a corta distancia. Las balas perdidas, a pesar de la reducción de velocidad, pueden causar lesiones graves debido a la guiñada y la cavitación, especialmente en los cráneos de los niños.

Conclusiones:

  • Las lesiones por balas perdidas son totalmente prevenibles y requieren un enfoque multidisciplinario que involucre legislación, aplicación y concienciación comunitaria. Reconocer la presentación sutil de las lesiones por balas perdidas es crucial para una evaluación médico-legal precisa. Son necesarias medidas urgentes de salud pública y legales para mitigar la ocurrencia de estos trágicos eventos.