Video Experimental Relacionado
Updated: Apr 25, 2026
09:44
Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
Published on: June 5, 2014
15.6K
Las fuerzas de cohesión evitan la ruptura rotacional del asteroide de la pila de escombros (29075) 1950 DA
Ben Rozitis1, Eric MacLennan1, Joshua P Emery1
1Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA.
Nature
|August 15, 2014
Resumen
Los pequeños asteroides pueden mantenerse unidos por fuerzas de cohesión, no solo por la gravedad. Este hallazgo explica cómo los asteroides de pilas de escombros pueden girar más rápido de lo que se creía posible.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astrofísica es la astrofísica.
- Geología Geología Geología.
Sus antecedentes:
- Los asteroides son a menudo montones de escombros sueltos, no cuerpos sólidos.
- Su comportamiento se explica típicamente por la gravedad y la fricción.
- Recientemente se predijo que las fuerzas de cohesión serían importantes para pequeñas pilas de escombros.
Objetivo del estudio:
- Investigar el papel de las fuerzas de cohesión en pequeños asteroides de pilas de escombros.
- Explique las velocidades de rotación rápidas observadas en pequeños asteroides.
- Analizar el comportamiento físico del asteroide (29075) 1950 DA.
Principales métodos:
- Análisis de la rotación del asteroide (29075) 1950 DA.
- Modelado del comportamiento de los materiales granulares bajo las fuerzas gravitacionales y de cohesión.
- Comparación de las fuerzas de cohesión con el regolito lunar.
Principales resultados:
- El asteroide (29075) 1950 DA es un montón de escombros que gira más rápido de lo que la gravedad y la fricción permiten.
- Las fuerzas de cohesión son necesarias para evitar el fallo estructural.
- La fuerza de estas fuerzas es comparable a la del regolito lunar.
Conclusiones:
- Las fuerzas de cohesión, como las fuerzas de van der Waals, son cruciales para la integridad estructural de pequeños asteroides de montones de escombros.
- Estas fuerzas explican las velocidades de rotación inesperadamente rápidas de los pequeños asteroides.
- Una mayor investigación sobre las fuerzas de cohesión puede refinar los modelos de comportamiento de los asteroides.
Videos de Conceptos Relacionados
01:25Coplanar Forces
5.3K
Consider an object upon which multiple forces are acting. If the lines of action of each force lie within the same plane, the system can be considered coplanar. The Cartesian vector form can be used to resolve each force into its respective components. For a coplanar system, the system will be in equilibrium if each component of the resultant force equals zero and the resultant force on the system is zero. If the sum of the forces is not equal to zero, then the object will not be in equilibrium...
5.3K
01:12Reduced Mass Coordinates: Isolated Two-body Problem
2.5K
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
2.5K
01:15Elastic Collisions: Case Study
16.9K
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...
16.9K
01:00Elastic Collisions: Introduction
11.9K
An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
11.9K
01:21Rigid Body Equilibrium Problems - II
6.4K
A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
6.4K
01:05Collisions in Multiple Dimensions: Introduction
6.1K
It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
6.1K