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The law of '''conservation of momentum''' is the observation that the total [[momentum]] in a [[Closed Isolated System|closed isolated system]] remains the same before and after all any interaction between those [[particle]]s (provided no external [[Fundamental InteractionsResultant Force|fundamental interactionsresultant forces]] between acts upon that [[particlesystem]]s.

: *'''Conservation of momentum''' applies to all types of [[Collide|collisions]] and interactions.*[[Momentum]] is a [[vector]] quantity, meaning it has both [[magnitude]] and direction.*'''Conservation of momentum''' indicates that the total [[momentum]] before an interaction is equal to the total [[momentum]] after the interaction.*'''Conservation of momentum''' is a fundamental principle in [[Mechanics (Physics)|mechanics]] and [[Dynamics (Physics)|dynamics]].*'''Conservation of momentum''' is used to analyse the motion of [[object]]s before and after [[Collide|collisions]].*'''Conservation of momentum''' is a consequence of [[Newton's Third Law|Newton's third law of motion]].*In a [[Fundamental Interactions|fundamental interaction]] between [[Subatomic Particle|subatomic particles]] '''momentum is conserved'''. This can be used to detect new [[Subatomic Particle|particles]] which cannot be seen in a cloud chamber. Any time a [[Fundamental Interactions|particle interaction]] appears to violate '''conservation of momentum''' it means that a new, unseen [[Subatomic Particle|particle]] has been created and carried away the [[momentum]].