かく運動 うんどう りょう保存 ほぞん法則 ほうそくだったら
kaku undōryōhozonno hōsokudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 角運動量保存の法則

1. If/when the law of conservation of angular momentum…; If the law of conservation of angular momentum held…

Tara Conditional
Physics