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Engineering Mechanics

Engineering Mechanics. Lecture Notes. New words. Engineer [,endʒi'niə] n. 工程师；工兵；火车司机 vt. 设计； 工程 vi. 设计；建造 Mechanics [mɪ'k æ nɪks] n. 力学 （用作单数）；结构；技术；机械学（用作单数） unit ['ju:nɪt] n. 单位，单元；装置； [ 军 ] 部队；部件. Content n. 内容 ，目录；满足；容量 Module [ ‘ mɔdju:l] n. 模块 ； 组件 Force [fɔ:s] n. 力

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Engineering Mechanics

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  1. Engineering Mechanics Lecture Notes

  2. New words • Engineer [,endʒi'niə] n. 工程师；工兵；火车司机 vt. 设计；工程 vi. 设计；建造 • Mechanics [mɪ'kænɪks] n. 力学（用作单数）；结构；技术；机械学（用作单数） • unit ['ju:nɪt] n. 单位，单元；装置；[军] 部队；部件

  3. Content n. 内容，目录；满足；容量 • Module [‘mɔdju:l] n. 模块； 组件 • Force [fɔ:s] n.力 • System ['sɪstəm] n. 系统；体制，体系；制度

  4. external [ɪk'stɜ:n(ə)l; ek-] adj. 外部的；表面的；[药] 外用的；外国的；外面的 n. 外部；外观；外面 • truss [trʌs] n. 束；构架；捆;桁架 vt. 捆绑；用构架支撑

  5. Equilibrium [,i:kwɪ'lɪbrɪəm] n. 均衡；平静；保持平衡的能力 • Friction ['frɪkʃ(ə)n] n. 摩擦，[力] 摩擦力 • Internal [ɪn'tɜ:n(ə)l] adj. 内部的；内在的；国内的

  6. Certain [‘sɜ：t(ə)n; -tɪn] adj. 某一；必然的；确信；无疑的；有把握的 pron. 某些；某几个 • Vector ['vektə] n. 矢量；带菌者；航线 vt. 用无线电导航

  7. representation [,reprɪzen'teɪʃ(ə)n] n. 代表；表现；表示法；陈述 • fundamental [fʌndə'ment(ə)l] adj. 基本的，根本的 n. 基本原理；基本原则 • quantity['kwɒntɪtɪ] n. 量，数量；大量；总量

  8. Law [lɔ：]n. 法律；规律；法治；法学；诉讼；司法界 vi. 起诉；控告 vt. 控告；对…起诉 • Idealization [aɪ'dɪəlɪ'zeʃən] n. 理想化；理想化的事物

  9. body ['bɒdɪ] n. 身体；主体；物体；大量；团体；主要部分 vt. 赋以形体 • branch [brɑ：n(t)ʃ] vt. 分支；出现分歧 vi. 分支；出现分歧 n. 树枝，分枝；分部；支流

  10. rest [rest] vt. 使休息，使轻松；把…寄托于 n. 休息，静止；休息时间；剩余部分；支架 vi. 休息；静止；依赖；安置 • statics ['stætɪks] • n. [力] 静力学

  11. dynamics [daɪ'næmɪks] n. 动力学，力学 • fundamental [fʌndə'ment(ə)l] adj. 基本的，根本的 n. 基本原理；基本原则 • arbitrary ['ɑ：bɪt(rə)rɪ] adj. [数] 任意的；武断的；专制的；专门的

  12. independent [,ɪndɪ'pendənt] adj. 独立的；单独的；无党派的；不受约束的 n. 独立自主者；无党派者 • derive [dɪ'raɪv] adj. 导出的；衍生的，派生的 v. 得到；推断；由…而来

  13. particle ['pɑ：tɪk(ə)l] n. 颗粒；[物] 质点；极小量；小品词 • velocity [vɪ'lɒsɪtɪ] n. [力] 速率；迅速；周转率 • acceleration [əkselə'reɪʃ(ə)n] n. 加速，促进；[物] 加速度

  14. interact [ɪntər'ækt] vt. 互相影响；互相作用 vi. 互相影响；互相作用 n. 幕间剧；幕间休息 • magnitude [‘mægnɪtju:d] n. 大小；量级；[地震] 震级；重要；光度

  15. collinear [kə'lɪnɪə] adj. [数] 共线的；同线的；在同一直线上的 • rigid ['rɪdʒɪd] • adj. 严格的；僵硬的，死板的；坚硬的；精确的；刚性的 • volume [‘vɒlju:m] n. 量；体积；卷；音量；大量；册 • gravitational [,ɡrævɪ'teʃənl] adj. [力] 重力的，[力] 引力的

  16. deformable[,di'fɔ:məbl] adj. 可变形的 • distribute [dɪ‘strɪbju:t;] vt. 分配；散布；分开；分布；把…分类 • pressure ['preʃə] n. 压力；压迫，[物] 压强 vt. 迫使；密封；使……增压

  17. Module Contents • Force Systems (2D) (I & II) • Equilibrium • Friction • Internal Forces & External Reactions of Certain Structures * Truss Structures • Force Systems & Equilibrium (3D) – Vector Representation

  18. Introduction • Mechanics • Brief History • Four Fundamental Quantities & SI Units • Newton’s Laws • Idealization of Real Bodies • Forces

  19. Mechanics • A Branch of Physical Science –Deals with the state of rest or motion of bodies under the action of forces • Part 1: Statics The EQUILIBRIUM of bodies under the action of forces

  20. Mechanics • Part 2: Dynamics - Not covered in this course The MOTION of bodies under the action of forces • Engineering Mechanics – Statics Fundamental to almost all engineering fields to many modules

  21. Brief History quantum ['kwɒntəm] n. 量子论； Einstein ['ainstain] n. 爱因斯坦（著名物理学家） stevinus [ste'vi:nəs] 斯蒂文 Archimedes [,a:ki‘mi:di:z] n. 阿基米德（古希腊数学家、物理学家、发明家、学者）；

  22. Fundamental Quantities &SI Units • Defined by Arbitrary International Standards – SI Units: (French) Systems International Unites – Independent or Derived Independent Unit Symbol Meter – Length (L) (m) Second (s) – Time (T) Kilogram (Kg) – Mass (M) Derived (N) Newton – Force (F)

  23. Newton’s First Law • A particle remains at rest or continues to move in a straight line with a constant velocity if there is no unbalanced force acting on it • – Equilibrium - Rest/ Moving in const. Speed • – Balanced Force -> Equilibrium

  24. Newton’s Second Law • A particle acted upon by an unbalanced force F experiences an acceleration a in the direction of force: F = ma 1 N = 1 Kg m/s2 (Derived) (Equilibrium) a=0 F=0

  25. Newton’s Third Law The forces of action (F) and reaction (F’) between interacting bodies are equal in magnitude, opposite in direction, and collinear: F = - F’ A F A F’ B B – The Action and Reaction are acting on different bodies

  26. Idealization of Real Bodies • Particle: – A point, has mass, but no size • Rigid Body: –There is no relative position change between its particles • Deformable Body: (not in statics) – The relative positions between its particles are changed under the action of forces

  27. Idealization of Forces • Concentrated/Point Force – acting on a small area • Distributed Force –acting on a large area e.g. wind pressure – acting on a volume e.g. gravitational force wind

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