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Related Concept Videos

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.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Projectile Motion: Example01:18

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The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on...
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Projectile Motion01:20

Projectile Motion

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An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
When an object falls under gravity and has no...
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Types of Collisions - II01:19

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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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Projectile Motion: Equations01:26

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Projectile motion is commonly observed in our day-to-day life. For example, a basketball thrown by a player, an arrow shot from a bow, and kids jumping into the pool, all undergo projectile motion.
Any projectile motion problem can be solved by using the following strategy:
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Related Experiment Video

Updated: Oct 12, 2025

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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Kinetic Projectile Injuries Treated During Civil Protests in Los Angeles: A Case Series.

Rachel C Pearl1, Sam Torbati1, Joel M Geiderman1

  • 1Cedars-Sinai Medical Center, Department of Emergency Medicine, Los Angeles, California.

Clinical Practice and Cases in Emergency Medicine
|November 23, 2021
PubMed
Summary

Law enforcement

Area of Science:

  • Public Health
  • Trauma Surgery
  • Forensic Medicine

Background:

  • Kinetic impact projectiles (KIPs) were utilized by law enforcement for crowd control during protests following George Floyd's death.
  • This study examines injuries resulting from KIP use during a specific protest period.

Purpose of the Study:

  • To document the spectrum of injuries caused by kinetic impact projectiles.
  • To contribute to the understanding of the public health impact of crowd-control weapons.

Main Methods:

  • A retrospective review of emergency department visits was conducted.
  • Data from 14 patients injured by KIPs during a 48-hour protest period were analyzed.

Main Results:

  • Patients presented to a Level 1 trauma center with injuries sustained from KIPs.

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  • The study details the types and severity of injuries observed.

    • Conclusions:

    • Kinetic impact projectiles can inflict severe injuries.
    • The use of less lethal weapons for crowd control, particularly when guidelines are not followed, may be inappropriate.