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www.dummies.com/education/science/physics/conserving-kinetic-energy

In some types of collisions, called elastic collisions, kinetic energy and momentum are conserved. What do elastic collisions look like? In general, there’s no permanent deformation of any of the objects from an elastic collision. The objects involved might initially deform, but they immediately spring back to their original shape. Here are the equations for […]

hyperphysics.phy-astr.gsu.edu/hbase/elacol.html

Elastic Collisions. An elastic collision is defined as one in which both conservation of momentum and conservation of kinetic energy are observed. This implies that there is no dissipative force acting during the collision and that all of the kinetic energy of the objects before the collision is still in the form of kinetic energy afterward.

Kinetic energy is not always conserved during collisions. It is conserved during purely elastic collisions, but that is tautological. The definition of a purely elastic collision is one in which kinetic energy is conserved. Kinetic energy is not conserved, for example, if the colliding objects stick together. (This is a purely inelastic collision).

physics.stackexchange.com/questions/92051/how-can-momentum-but-not-energy-be...

Energy and momentum are always conserved. Kinetic energy is not conserved in an inelastic collision, but that is because it is converted to another form of energy (heat, etc.). The sum of all types of energy (including kinetic) is the same before and after the collision.

en.wikipedia.org/wiki/Inelastic_collision

An inelastic collision, in contrast to an elastic collision, is a collision in which kinetic energy is not conserved due to the action of internal friction. In collisions of macroscopic bodies, some kinetic energy is turned into vibrational energy of the atoms, causing a heating effect, and the bodies are deformed.

quizlet.com/111585931/conservation-of-momentum-flash-cards

Most collisions fall somewhere between these extremes, depending on the amount of kinetic energy that is conserved by the objects. True Most collisions tend to be partially or completely elastic.

www.quora.com/Why-is-kinetic-energy-conserved-in-an-elastic-collision

In inelastic collisions, kinetic energy is not conserved since there is dissipation of energy in the form of heat, light, sound etc. On the other hand, in elastic collisions, the entire energy is utilised in moving the two bodies. 147 views. Marco Garcia. Answered Oct 30, 2015.