Collision: Difference between revisions

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			In ], collision means the action of bodies striking or coming together. Collisions can be either ] or ] (or ''plastic'').
	]
	]
	]

			In ] a '''collision''' is an ] or even a ]. ] are designed for collisions for fun.
	==Physical collision==

	===Dynamics===
	] happens when an object hits a plane surface]]
	In ], '''collision''' means the action of bodies striking or coming together (]ing). Collisions involve forces (there is a change in ]). Collisions can be ], meaning they conserve ] and ], ], meaning they conserve momentum but not energy, or totally inelastic (or ]), meaning they conserve momentum and the two objects stick together.

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

	The field of ] is concerned with moving and colliding objects.

	===Billiards===

	In ], collisions play an important role. Because the collisions between billiard balls are almost perfectly elastic, and the balls roll on a low-] surface, their predictable behaviour is often used to illustrate ].

	===Traffic===

	In ] such a collision can be between two ]s, a vehicle and a ], a vehicle and an ], two persons or a person and an object (and more if an ] is involved). It is an ] or even a ]. At ]s sometimes a ] collides with a vehicle or person. Due to the ] and ] of a train it needs a long distance to stop, typically longer than the train ] 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 ] and momentum.

	====See also====
	*]

	===Attacks by means of a deliberate collision===

	Attacks by means of a deliberate collision can be:
	* with the body: unarmed ], ], ], ], ]
	* striking directly with a ] weapon, such as a ], ] or ]

	An attacking collision with a distant object can be achieved by throwing or launching a ]. Projectiles can be:
	* unpowered, thus depending on momentum transferred from the launcher:
	** ]
	** ]
	** ]
	** ]
	** ]
	* powered in flight:
	** ]
	* guided in flight:
	** ]

	Rockets and missiles usually carry explosives, in which case they do not need to achieve a direct collision to be effective, if they are detonated at the right moment.

	===Others===

	*A "collision" applied for construction work, is hitting a ] with a ], etc., and for ] a ]-beater.
	*In ] a ball is hit with a ], in ] also a ball or other object is hit, in ] a ball hits a target.
	*]s slam ]s, ]s, and ]s together.
	*] for use in ], ], ], physical ] etc.
	*] are designed to collide for fun.

	See also: ], ], ]

	==Telecommunications==

	In ], the term '''collision''' has the following meanings:		In ], the term '''collision''' has the following meanings:
	# In a ] ], the situation that occurs when two or more demands are made simultaneously on equipment that can handle only one at any given instant.		# In a ] ], the situation that occurs when two or more demands are made simultaneously on equipment that can handle only one at any given instant.
	# In a ], the situation that occurs when an attempt is made to store simultaneously two different data items at a given ] that can hold only one of the items.		# In a ], the situation that occurs when an attempt is made to store simultaneously two different data items at a given ] that can hold only one of the items.

⚫	''Source: from ] and from ]''

		⚫	Source: from ] and from ]
	===See also===
	*]

Revision as of 14:35, 13 May 2003

In physics, collision means the action of bodies striking or coming together. Collisions can be either elastic or inelastic (or plastic).

In traffic a collision is an accident or even a disaster. Bumper cars are designed for collisions for fun.

In telecommunication, the term collision has the following meanings:

In a data transmission system, the situation that occurs when two or more demands are made simultaneously on equipment that can handle only one at any given instant.
In a computer, the situation that occurs when an attempt is made to store simultaneously two different data items at a given address that can hold only one of the items.

Source: from Federal Standard 1037C and from MIL-STD-188