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[[File:Collision_9_Block.gif|Collision 9 Block|thumb]] [[File:Deflection.png|Deflection|thumb|left]] [[Image:Inelastischer_stoß.gif|Inelastischer stoß|thumb|left]] [[File:HRIV_Impact.gif|HRIV Impact|thumb]] '''Collision''' refers to an event where two or more bodies exert forces on each other for a relatively short time. Although the most common context for discussing collisions is in the realm of [[physics]], the concept also applies broadly in other fields such as [[astronomy]], [[chemistry]], and even in [[sociology]] and [[economics]] where it can describe conflicts or interactions between entities.

==Types of Collisions==
Collisions can be categorized in several ways, primarily based on the conservation of physical quantities such as [[momentum]] and [[kinetic energy]].

===Elastic Collision===
In an '''elastic collision''', both momentum and kinetic energy are conserved. These types of collisions are most commonly studied in idealized systems since, in the real world, some energy is almost always transformed into other forms, such as heat or sound. Elastic collisions are significant in understanding molecular and atomic interactions, particularly in the field of [[quantum mechanics]].

===Inelastic Collision===
An '''inelastic collision''' is characterized by the conservation of momentum but not kinetic energy. A portion of the kinetic energy is converted into other forms of energy, such as heat or potential energy. Most real-world collisions are inelastic, such as car crashes or football tackles. A special case of inelastic collisions is the perfectly inelastic collision, where the colliding bodies stick together after the collision, moving as a single entity.

===Superelastic Collision===
Less commonly discussed are '''superelastic collisions''', where the total kinetic energy of the system after the collision is greater than before the collision. This increase in kinetic energy typically comes from the release of internal potential energy, as seen in certain atomic and nuclear reactions.

==Physics of Collisions==
The study of collisions in [[physics]] involves analyzing the forces involved and the conservation laws. The [[conservation of momentum]] is a fundamental principle that applies to all collisions. According to this principle, the total momentum of a system remains constant if it is not acted upon by external forces.

The outcome of a collision can be predicted using the laws of motion and the conservation principles. For elastic collisions, the conservation of kinetic energy can be used alongside momentum conservation to solve for the final velocities of the colliding bodies.

==Applications and Implications==
Collisions have wide-ranging applications and implications across various fields:

- In [[engineering]] and [[safety analysis]], understanding collisions is crucial for designing safer vehicles and infrastructure.
- In [[sports science]], the analysis of collisions can help improve the performance of athletes and reduce the risk of injury.
- In [[astronomy]], collisions between celestial bodies, such as asteroids and planets, play a significant role in the formation and evolution of the solar system.
- In [[chemistry]], collision theory explains how chemical reactions occur through the interaction of molecules.

==See Also==
* [[Momentum]]
* [[Kinetic Energy]]
* [[Conservation Laws]]
* [[Quantum Mechanics]]

[[Category:Physics]]
[[Category:Mechanics]]

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Collision - Revision history

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