Momentum = mass x velocity
p = mv
Conservation of momentum: For a closed system, in any specified direction, the total momentum before an interaction (e.g. collision) is equal to the total momentum after the reaction.
In all interactions, momentum and total energy are conserved.
Impulse: The change in momentum of a body
A perfectly elastic collision is one in which no momentum or KE is lost. An inelastic collision is one in which momentum is conserved but KE is lost.
In a perfectly elastic collision, KE is conserved whereas in an inelastic collision, KE is transformed into other forms of energy (heat, sound). Most collisions are inelastic.
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