かく運動 うんどう りょう保存 ほぞん法則 ほうそくなら
kaku undōryōhozonno hōsokunara

Noun
Da Copula

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

1. If the law of conservation of angular momentum…; If, assuming the law of conservation of angular momentum…

Nara Conditional
Physics