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Encyclopedia > Collision

In physics, collision means the action of bodies striking or coming together (touching). Look up collision in Wiktionary, the free dictionary. ... The first few hydrogen atom electron orbitals shown as cross-sections with color-coded probability density. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Contents

Dynamics

Deflection happens when an object hits a plane surface
Deflection happens when an object hits a plane surface

Collisions involve forces (there is a change in velocity). Collisions can be elastic, meaning they conserve energy and momentum, inelastic, meaning they conserve momentum but not energy, or totally inelastic (or plastic), meaning they conserve momentum and the two objects stick together. Image File history File links Deflection diagram made by User:Kieff File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Deflection diagram made by User:Kieff File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... [[ Deflection happens when an object hits a plane surface In physics In physics deflection is the event where an object collides and bounces against a plane surface. ... The velocity of an object is simply its speed in a particular direction. ... An elastic collision is a collision in which the total kinetic energy of the colliding bodies after collision is equal to their total kinetic energy before collision. ... In classical mechanics, momentum (pl. ... An inelastic collision is a collision in which some of the kinetic energy of the colliding bodies is converted into internal energy in at least one body such that kinetic energy is not conserved. ...


The magnitude of the velocity difference at impact is called the closing speed.


The field of dynamics is concerned with moving and colliding objects. In physics, dynamics is the branch of classical mechanics that is concerned with the effects of forces on the motion of objects. ...


Billiards

In billiards, collisions play an important role. Because the collisions between billiard balls are nearly elastic, and the balls roll on a low-friction surface, their predictable behaviour is often used to illustrate Newton's laws of motion. This article is about the various cue sports. ... Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. ... Newtons First and Second laws, in Latin, from the original 1687 edition of the Principia Mathematica. ...


Traffic

In traffic such a collision can be between two vehicles, a vehicle and a person, a vehicle and an object, two persons or a person and an object (and more if an animal is involved). It is an accident or even a disaster. At level crossings sometimes a train collides with a vehicle or person. Due to the speed and weight of a train it needs a long distance to stop, typically longer than the train driver can see ahead. When a train collides with a car this is more likely to be deadly for the people in the car than for those in the train, because the train has more mass and momentum. Nighttime traffic captured by a camera over several seconds. ... The Trikke is a Human Powered Vehicle (HPV) This article is about the means of transport. ... A person is defined by philosophers as a being who is in possession of a range of psychological capacities that are regarded as both necessary and sufficient to fulfill the requirements of personhood. ... In philosophy, an object is a thing, an entity, or a being. ... Phyla Subregnum Parazoa Porifera Subregnum Eumetazoa Placozoa Orthonectida Rhombozoa Radiata (unranked) Ctenophora Cnidaria Bilateria (unranked) Acoelomorpha Myxozoa Superphylum Deuterostomia Chordata Hemichordata Echinodermata Chaetognatha Xenoturbellida Superphylum Ecdysozoa Kinorhyncha Loricifera Priapulida Nematoda Nematomorpha Onychophora Tardigrada Arthropoda Superphylum Platyzoa Platyhelminthes Gastrotricha Rotifera Acanthocephala Gnathostomulida Micrognathozoa Cycliophora Superphylum Lophotrochozoa Sipuncula Nemertea Phoronida Ectoprocta Bryozoa... A railing accidentally collapses at a college football game, spilling fans onto the sidelines An accident is something going wrong unexpectedly. ... The term level crossing (also called a railroad crossing, railway crossing, train crossing or grade crossing) is a crossing on one level (at-grade intersection) — without recourse to a bridge or tunnel — of a railway line by a road, path, or another railroad. ... A typical North American steam train In rail transport, a train consists of rail vehicles that move along guides to transport freight or passengers from one place to another. ... Speed is the rate of motion, or equivalently the rate of change of position, many times expressed as distance d moved per unit of time t. ... In the physical sciences, weight is a measurement of the gravitational force acting on an object. ... Driving is the controlled operation of a vehicle, which is usually a motor vehicle such as a truck, bus, or car. ... Unsolved problems in physics: What causes anything to have mass? Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. ...


See also

The result of excessive speed, this cement truck rolls over into the front garden of a house. ... An elastic collision is a collision in which the total kinetic energy of the colliding bodies after collision is equal to their total kinetic energy before collision. ... An inelastic collision is a collision in which some of the kinetic energy of the colliding bodies is converted into internal energy in at least one body such that kinetic energy is not conserved. ... The doomed Boeing 727, PSA Flight 182, crashes in flames after colliding with another aircraft in 1978 A mid-air collision (MAC) is an aviation accident where two or more aircraft come into unplanned contact during flight. ... Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. ...

External links

  • Two Dimensional Collision - Java applet that simulates elastic collisions.

  Results from FactBites:
 
Rain leads to collision at I-75, Route 4 interchange (155 words)
Rain leads to collision at I-75, Route 4 interchange
Flash player is required to view weather conditions.
A Dayton dispatcher said crews had not removed any victims from the crash but did not know when the interchange would reopen.
Cryptography Research - Hash Collision Q&A (1054 words)
The collisions against MD4, MD5, HAVAL-128, and RIPEMD were found by the Chinese researcher Xiaoyun Wang with co-authors Dengguo Feng, Xuejia Lai, and Hongbo Yu.
In contrast, a collision attack finds two messages with the same hash, but the attacker can't pick what the hash will be.
For example, a devastating attack would be one that enabled adversaries to obtain a legitimate server certificate with a collision to one containing a wildcard for the domain name and an expiration date far in the future.
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