动力学 质点系的质量与其质心速度的乘积就等于质点系的动量。则 Px=Mc=Mic, py=M,=Mic, P= MC=MEC 3.刚体系统的动量 设第i个刚体mVa则整个系统: p=∑ma m v Ppp ∑∑∑ mivo ∑∑∑ mm miNi m.2x Cx C y Cy C z Cz C p = Mv = Mx , p = Mv = My , p = Mv = Mz ⒊ 刚体系统的动量 设第i个刚体 mi vci 则整个系统: = i Ci p m v = = = = = = z i Ciz i Ci y i Ciy i Ci x i Cix i Ci p m v m z p m v m y p m v m x 质点系的质量与其质心速度的乘积就等于质点系的动量。则: