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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

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

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. ...

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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