Changes

Momentum is a conserved quantity, meaning that the total momentum of any closed [[system]] (one not affected by external forces) cannot [[change]]. This law is also true in [[special relativity]].

Momentum is a conserved quantity, meaning that the total momentum of any closed [[system]] (one not affected by external forces) cannot [[change]]. This law is also true in [[special relativity]].

<center>For lessons on the [[topic]] of '''''Momentum''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Momentum this link].</center>

<center>For lessons on the [[topic]] of '''''Momentum''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Momentum this link].</center>

==History of the concept==

==History of the concept==

Mōmentum was not merely the [[motion]], which was mōtus, but was the [[power]] residing in a moving object, captured by today's [[mathematical]] definitions. A mōtus, "[[movement]]", was a [[stage]] in any sort of [[change]],[1] while velocitas, "swiftness", captured only [[speed]]. The [[Romans]], handicapped by the limitations inherent in the Roman numeral system which lacks a [[symbol]] for [[zero]], took these [[ideas]] no further.

Mōmentum was not merely the [[motion]], which was mōtus, but was the [[power]] residing in a moving object, captured by today's [[mathematical]] definitions. A mōtus, "[[movement]]", was a [[stage]] in any sort of [[change]],[1] while velocitas, "swiftness", captured only [[speed]]. The [[Romans]], handicapped by the limitations inherent in the Roman numeral system which lacks a [[symbol]] for [[zero]], took these [[ideas]] no further.