如图1所示,质量为 m 的质点 A以速度 v 运动,质点 A 到转动轴 O 的距离为 r,将 rmvsinθ定义为质点 A相对于转动轴 O 的角动量,也可以写成 rmv⊥,其中 v⊥表示速度 V 沿垂直于 AO 方向的分量.若质点 A 所受的 As shown in Fig. 1, a mass A of mass m moves at velocity v, the distance of mass A from axis of rotation O is r, and rmvsinθ is defined as the angular momentum of mass A relative to axis of rotation O, which can also be written as rmv⊥, where v⊥ represents the component of velocity V in a direction perpendicular to AO.If the particle A is subjected to