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In physics, collision means the action of bodies striking or coming together ( touching). Collisions involve forces (there is a change in velocity). Collisions can be elastic, meaning they conserve energy and momentum, inelastic, meaning they conserve momentum, or totally inelastic (or plastic), 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 dynamics is concerned with moving and colliding objects.
In billiards, collisions play an important role. Because the collisions between billiard balls are almost perfectly elastic, and the balls roll on a low- friction surface, their predictable behaviour is often used to illustrate Newton's laws of motion.
In traffic such a collision can be between two vehicles, a vehicle and a person, a vehicle and an objectAs used in philosophy, in general, an object is something that can have properties and relations. Hence a particular object is, basically, either a particular material body or a particular mind--or, on a neutral monist view, a particular that can be viewe, two persons or a person and an object (and more if an animalSubkingdom Parazoa Porifera (sponges) Subkingdom " Agnotozoa" Placozoa Orthonectida Rhombozoa Subkingdom Metazoa "Radiata" Cnidaria Ctenophora (comb jellies) Bilateria Protostomia Acoelomorpha Platyhelminthes (flatworms) Nemertina (ribbon worms) Gastrotri is involved). It is an accidentAlternate meanings: Accident (fallacy), Accident (philosophy), Accident (movie), Accident, Maryland An accident is something going wrong. Physical examples include an unintended collision (including a person or object unintendedly falling, and including a or even a disasterA disaster is an unexpected natural or man-made catastrophe of substantial extent causing significant property damage or destruction, loss of life or sometimes permanent changes to the natural environment. Disasters may also be unforeseen events which dev. At level crossingThe term level crossing (American English: grade crossing is a crossing on one level, or "at grade" without recourse to a bridge or tunnel used to describe the crossing of a railway line by a road It also applies when a light rail line with separate rights sometimes a trainThis article is about trains in rail transport. For other types of train see train (disambiguation Coventry, England In rail transport, a train consists of several connected rail vehicles that are capable of being moved together along a guideway to transp collides with a vehicle or person. Due to the speedFor alternate uses, see Speed (disambiguation). Speed (symbol: v is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t''. Speed is a scalar quantity with dimensions Length/ Time; the equiva and weightFor the 1994 album by the group Rollins Band, see Weight (album). Weight is the force exerted upon an object by virtue of its position in a gravitational field. In a constant gravitational field, such as the Earth's, this force is proportional to the obje 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.
See also: Car accident