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Related Concept Videos

Projectile Motion01:20

Projectile Motion

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 horizontal...
Types of Collisions - II01:19

Types of Collisions - II

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...
Impact01:30

Impact

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...
Types of Impact01:30

Types of Impact

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...
Impact: Problem Solving01:26

Impact: Problem Solving

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...
Projectile Motion01:25

Projectile Motion

Projectile motion models the flight of an object launched into the air, such as a soccer ball kicked during a penalty, under the simplifying assumption that air resistance is negligible. When gravity is the only force, the object experiences a steady downward acceleration at all times. This single fact explains why projectile motion can be analyzed as two independent motions happening simultaneously: a horizontal motion that does not speed up or slow down, and a vertical motion that continually...

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Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
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Projectile interactions in granular impact cratering.

E L Nelson1, H Katsuragi, P Mayor

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

Granular media interactions influence impact cratering. Container boundaries and multiple balls affect penetration depth and cause repulsion, especially sidewalls and side-by-side drops.

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Last Updated: Jun 25, 2026

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Published on: June 5, 2014

Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions
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Published on: September 29, 2019

Area of Science:

  • Physics of granular materials
  • Impact dynamics
  • Fluid-particle interactions

Background:

  • Understanding granular media behavior is crucial in various scientific and engineering fields.
  • Impact cratering is a fundamental process in planetary science and materials science.

Purpose of the Study:

  • To investigate the role of granular medium in mediating interactions during impact cratering.
  • To analyze the influence of container boundaries (bottom and sidewall) and inter-particle interactions on impact dynamics.

Main Methods:

  • Experimental setup involving dropping a ball into a granular medium within a container.
  • Varying parameters such as drop height, fill depth, and presence of multiple balls.
  • Observing and quantifying the impact cratering process and penetration depth.

Main Results:

  • The granular medium mediates interactions between the impacting ball and container boundaries, as well as between multiple balls.
  • The bottom boundary surprisingly increases penetration depth at low drop heights and shallow fill depths.
  • The sidewall boundary leads to reduced penetration and effective repulsion.
  • Repulsive forces are also observed between two balls dropped simultaneously side by side.

Conclusions:

  • Container boundaries significantly alter impact cratering dynamics in granular media.
  • The granular medium plays an active role in mediating repulsive and attractive forces during impacts.
  • These findings have implications for understanding complex granular flows and impact phenomena.