§3-1Work(功) §3-2 Kinetic Energy(动能) and the law of Kinetic Energy(动能定理) §3-3 Conservative force(保守力)& Potential Energy of Weight Elastic potential energy (弹性势能) Universal gravitational Potential Energy §3-4 Conservation of Mechanical Energy(机械能) 83-5 The Conservation of Energy§3-1 Work（功） §3-2 Kinetic Energy（动能）and The Law of Kinetic Energy（动能定理） §3-3 Conservative Force（保守力） & Potential Energy of Weight Elastic Potential Energy （弹性势能） Universal Gravitational Potential Energy §3-4 Conservation of Mechanical Energy（机械能） §3-5 The Conservation of Energy