物理学 第五版 4-3角动量角动量守恒定律 2刚体定轴转动的角动量定理 CThe theoremof angular momentumofa rigid body rotating about fixed axis 质点m受合力矩M1(包括Mex、M) M=M.+M dl d(o d (m12o) dt dt dt ∑ M ∑ eX △∑m2o)= d(o) dt dt d(JO)_dL刚体绕某定轴转动时,作用于刚体的合外力矩 d=d等于刚体绕此定轴角动量随时间的变化率 When a rigid body rotates about a fixed axis, the combined external torque on the rigid body is equal to the change rate with respect to time of the angular momentum about the same axis 第四章刚体的转动 15/344-3 角动量 角动量守恒定律 第四章 刚体的转动 物理学 第五版 15/34 ex 2 d d( ) ( ) d d i i i J M M m r t t  = = =    2 刚体定轴转动的角动量定理 质点mi受合力矩Mi(包括Mi ex 、 Mi in ) in ex 2 d d( ) d ( ) d d d i i i i i i i L J M M M m r t t t  = + = = =   = 0 in Mi (The theorem of angular momentum of a rigid body rotating about fixed axis ) t L t J M d d d d( )    = =  刚体绕某定轴转动时,作用于刚体的合外力矩 等于刚体绕此定轴角动量随时间的变化率. When a rigid body rotates about a fixed axis, the combined external torque on the rigid body is equal to the change rate with respect to time of the angular momentum about the same axis