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Chapter 8 Potential Energy and Conservation of E nergy 第八章 位能與能量守恆 PowerPoint Presentation
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Chapter 8 Potential Energy and Conservation of E nergy 第八章 位能與能量守恆

Chapter 8 Potential Energy and Conservation of E nergy 第八章 位能與能量守恆

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Chapter 8 Potential Energy and Conservation of E nergy 第八章 位能與能量守恆

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  1. Chapter 8 Potential Energy and Conservation of Energy第八章 位能與能量守恆

  2. Chapter 8Potential Energy and Conservation of Energy 8-1 What is Physics? 8-2 Work and Potential Energy 8-3 Path Independence of Conservative Forces 8-4 Determining Potential Energy Values 8-5 Conservation of Mechanical Energy 8-6 Reading a Potential Energy Curve 8-7 Work Done on a System by an External Force 8-8 Conservation of Energy

  3. 8-1What is Physics? • Potential Energy 位能(U) • Gravitational Potential Energy 重力位能 • Elastic Potential Energy 彈力位能、彈性位能 • Electrical Potential Energy 電位能 • Technically, potential energy is energy that can be associated with the configuration of a system of objects that exert forces on one another

  4. bungee 鬆緊繩 bungee-cord bungee-cord jumper plunge 跳下

  5. 8-2 Work and Potential Energy • Conservative Force 守恆力、保守力 • Gravitational Force • Spring Force • Nonconservative Force 非守恆力、非保守力 • Kinetic frictional force • Drag force • Thermal Energy 熱能 • Thermal energy is not a potential energy

  6. 8-3 Path Independence of Conservative Forces • 與路徑無關的守恆力 • The net work done by a conservative force on a particle moving around any closed path is zero • The work done by a conservative force on a particle moving between two points does not depend on the path taken by the particle

  7. Sample Problem

  8. 8-4 Determining Potential Energy Values • Reference point 參考點、基準點

  9. Sample Problem

  10. 8-5 Conservation of Mechanical Energy 力學能守恆 • Mechanical Energy 力學能 • Kinetic energy 動能 • Potential energy 位能 • Principle of Conservation of Mechanical Energy 力學能守恆原理

  11. Sample Problem

  12. 8-6 Reading a Potential Energy Curve turning point 轉折點 equilibrium point 平衡點

  13. 轉折點與平衡點 • turning point 轉折點 • equilibrium point 平衡點 • unstable equilibrium • stable equilibrium

  14. Sample Problem

  15. 8-7 Work Done on a System by an External Force

  16. 8-8 Conservation of Energy • Law of Conservation of Energy 能量守恆定律、能量守恆律 • Internal energy 內能 • Isolated system 隔離系統、孤立系統

  17. Sample Problem