Theoretical Mechanics Chapter 14: Theorem of the change in the kinetic energy
1 Theoretical Mechanics
理论力学 第十
2
Chapter 14: Theorem of the change in the kinetic energy 心§141 Work done by a force D8 14-2 Kinetic energy D8 14-3 Theorem of kinetic energy 心§14-4 Power, power equation 8 14-5 Conservative forces field, potential energy, the law of conservation of mechanical energy 8 14-6 General theorems of dynamics and its applications
3 § 14-1 Work done by a force § 14-2 Kinetic energy § 14-3 Theorem of kinetic energy § 14-4 Power, power equation § 14-5 Conservative forces field, potential energy, the law of conservation of mechanical energy § 14-6 General theorems of dynamics and its applications Chapter 14:Theorem of the change in the kinetic energy
第十四章动能定理 §141力的功 §14-2动能 §14-3动能定理 §144功率·功率方程 §14-5势力场·势能·机械能守恒定理 §146动力学普遍定理及综合应用
4 §14–1 力的功 §14–2 动能 §14–3 动能定理 §14–4 功率 · 功率方程 §14–5 势力场 · 势能 · 机械能守恒定理 §14–6 动力学普遍定理及综合应用 第十四章 动能定理
D In order to obtain the theorem of the change in the kinetic energy, we make use of the energy method to investigate dynamical problems. In different to the cases of the theorems of the changes in the linear and the angular moment we make use of the vector method. The method not only has important applications in the research of the mechanicalmotion, but it is also the bridge connecting mechanical motion with other forms of motion .The theorem of the change in the kinetic energy establishes the dependence between the physical quantities describing motion---kinetic energy and describing the acting force work. It is a law describing changes between different forms of energy. 8 14-1 Work done by a force Work is a measure of the accumulated effect of the action of a force on a body during a given displacement 1. Work done by a constant force W=FS cos a M2 The work done by a force is a scalar quanti Fora <n, the work is positive, fora 2, the work is zero, for a>a, the work is negative. The unit of work in the SI system is the joule(). 1J=INIm
5 In order to obtain the theorem of the change in the kinetic energy,we make use of the energy method to investigate dynamical problems. In different to the cases of the theorems of the changes in the linear and the angular moment we make use of the vector method. The method not only has important applications in the research of the mechanical motion, but it is also the bridge connecting mechanical motion with other forms of motion.The theorem of the change in the kinetic energy establishes the dependence between the physical quantities describing motion---kinetic energy and describing the acting force--- work. It is a law describing changes between different forms of energy. Work is a measure of the accumulated effect of the action of a force on a body during a given displacement. 1. Work done by a constant force F S W FS = = cos The work done by a force is a scalar quantity. For , the work is positive, for , the work is zero, for , the work is negative. The unit of work in the SI system is the joule (J). 2 2 = 2 1J=1N1m § 14-1 Work done by a force