物理学 3-4动能定理 第五版 质点的动能定理 (Theorem of kinetic energy of particle w=EK2-E K 合外力对质点所作的功,等于质点动能的增量 The work done by the combined force on a mass point is equal to the increment of the kinetic energy of the mass point 功是过程量,动能是状态量; Work is a process dependent quantity The kinetic energy is a function of the motion state 功和动能依赖于惯性系的选取,但 注意 对不同惯性系动能定理形式相同 第三章动量守恒和能量守恒 9/123-4 动能定理 第三章 动量守恒和能量守恒 物理学 第五版 9/12 质点的动能定理 (Theorem of kinetic energy of particle) W  E k2  E k1 合外力对质点所作的功,等于质点动能的增量 . Ø 功是过程量，动能是状态量； 注意 Ø 功和动能依赖于惯性系的选取，但 对不同惯性系动能定理形式相同． The work done by the combined force on a mass point is equal to the increment of the kinetic energy of the mass point Work is a process dependent quantity The kinetic energy is a function of the motion state