对质量连续分布的刚体: dL=F×dmv dL=×dm=dmr2a 刚体对z轴的总角动量为: 圆图 L= al, -/adm=o]/dm=Jo 式中J=r2dm刚体对轴的转动惯量L r mv o d = d 2 dL r dmv dmr z = = 刚体对z轴的总角动量为: Lz = Lz = r m = r m = J d d d 2 2 v dm o r z 对质量连续分布的刚体: 式中 J r dm 2 = 刚体对轴的转动惯量