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Related Concept Videos

Impact01:30

Impact

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
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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.
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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Hydrostatic Pressure Force on a Plane Surface01:04

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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Types of Impact01:30

Types of Impact

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Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
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Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Principle of Angular Impulse and Momentum01:23

Principle of Angular Impulse and Momentum

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The angular impulse and momentum principle provides insights into how forces applied at a distance from an object's rotational axis influence its angular velocity. It builds upon the crucial relationship between the moment of force and angular momentum. By integrating this equation, substituting the limits for the initial and final times, a comprehensive expression representing the angular impulse and momentum principle is derived.
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Updated: Nov 9, 2025

Visualization of High Speed Liquid Jet Impaction on a Moving Surface
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Hydrodynamic instability at impact interfaces and planetary implications.

Avi Ravid1,2, Robert I Citron1, Raymond Jeanloz3

  • 1UC, Berkeley, CA, USA.

Nature Communications
|April 9, 2021
PubMed
Summary
This summary is machine-generated.

Planetary impacts create mixing zones between impactors and targets, even with minimal surface differences. This newly identified instability, similar to Richtmyer-Meshkov instability (RMI), aids in understanding meteorite formation.

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Last Updated: Nov 9, 2025

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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
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Area of Science:

  • Planetary Science
  • Geophysics
  • Impact Cratering

Background:

  • Impact-induced mixing is crucial for planetary geochemical evolution.
  • Mixing mechanisms during planetary impacts, beyond localized jetting, remain poorly understood.

Purpose of the Study:

  • To describe a new dynamic instability at the interface of impacting materials.
  • To investigate the growth of mixing zones during planetary impacts.

Main Methods:

  • Utilized hydrocode simulations to model impact dynamics.
  • Analyzed pressure perturbations amplified by shock-wave refraction.

Main Results:

  • A novel mixing zone grows between impactor and target materials, even with minimal initial topography.
  • This instability is related to Richtmyer-Meshkov instability (RMI) but occurs even with identical materials.

Conclusions:

  • Identified a new mechanism for impact-induced mixing relevant to planetary formation.
  • Findings suggest implications for the origin of stony-iron and other meteorites.
  • Results provide predictions for laboratory experimental validation.