Do kinetic energy conserved in a 2 dimensional collision?

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Kinetic energy is not always conserved in two-dimensional collisions, as it depends on whether the collision is elastic or inelastic. In elastic collisions, such as those between metal balls or billiard balls, kinetic energy is conserved, while inelastic collisions result in some kinetic energy being transformed into other forms of energy. Perfectly elastic collisions are theoretical, as real-world materials always exhibit some inelasticity. The degree of elasticity in a collision is influenced by the rigidity of the materials involved. Understanding these principles is crucial for analyzing collision dynamics in physics.
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Like the tittle suggests, do kinetic energy conserved in a 2 dimensional collision? Like when 2 metal balls collide. Thanks!
 
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Sometimes, when this happens we call it an elastic collision:
http://en.wikipedia.org/wiki/Elastic_collision

Sometimes, though, this does not happen. In these cases we call the collision an inelastic collision:
http://en.wikipedia.org/wiki/Inelastic_collision

Nothing is ever perfectly elastic, because kinetic energy is not a conserved quantity, but there are lots of examples where, for all intents and purposes, kinetic energy is conserved. Two metal balls would be a good example of this, and the classic example are billiard balls. How elastic or inelastic a collision is depends primarily on the rigidity of the materials the objects are made from.
 

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