📚 Year 9 Cambridge Engineering: Quick Terminology Memory Guide | Year 9 剑桥工程：词汇术语速记指南
Mastering engineering terminology is crucial for Year 9 Cambridge students. This guide provides concise definitions and memory aids for key terms across core topics, from forces and materials to electronics and design. Use these paired explanations to build a solid vocabulary foundation and gain confidence in discussing engineering concepts.
掌握工程术语对 Year 9 剑桥学生至关重要。本指南提供从力和材料到电子和设计等核心主题的关键术语简明定义与记忆辅助。利用这些中英配对的解释，构建扎实的词汇基础，自信地讨论工程概念。
1. Fundamentals of Forces and Motion | 力与运动基础
Forces govern how objects move or stay still. Engineers must describe them precisely using standard terminology.
力决定了物体的运动或静止状态。工程师必须使用标准术语准确描述它们。
Force: A push or pull acting on an object due to its interaction with another object. It can cause acceleration, deceleration, or deformation. Unit: newton (N).
力：因物体与另一物体相互作用而产生的推或拉。它可以使物体加速、减速或变形。单位：牛顿 (N)。
Mass: The amount of matter in an object. It is a scalar quantity and remains constant regardless of location. Unit: kilogram (kg).
质量：物体所含物质的量。它是一个标量，无论位置如何都保持不变。单位：千克 (kg)。
tional field strength. Weight = mass × gravitational field strength (g). Unit: newton (N).
重量：作用在质量上的引力。它是一个矢量，取决于引力场强度。重力 = 质量 × 引力场强度 (g)。单位：牛顿 (N)。
Resultant force: The single force that represents the vector sum of all forces acting on an object. It determines the object's overall motion.
合力：代表作用在物体上所有力的矢量总和的单一力。它决定物体的整体运动。
Friction: A resistive force that opposes motion between two surfaces in contact. It can be reduced by lubrication or smoother surfaces.
摩擦力：阻碍接触表面之间相对运动的阻力。可通过润滑或更光滑的表面减少。
F = m × a
牛顿第二定律：合力 = 质量 × 加速度
2. Materials and Their Properties | 材料及其特性
Choosing the right material is at the heart of engineering design. Understanding properties helps predict how materials behave under load.
选择正确的材料是工程设计的核心。了解材料特性有助于预测其在载荷下的行为。
Strength: The ability of a material to withstand an applied force without breaking. Tensile strength resists pulling; compressive strength resists pushing.
强度：材料承受外力而不发生破坏的能力。抗拉强度抵抗拉伸；抗压强度抵抗压缩。
Stiffness: A material's resistance to bending or deformation when a load is applied. A stiff material deflects very little, like carbon steel.
刚度：材料在承受载荷时抵抗弯曲或变形的能力。高刚度材料如碳钢变形很小。
Ductility: The capacity of a material to be drawn into a wire or stretched significantly before fracturing. Copper is highly ductile.
延展性：材料被拉伸成丝或在断裂前显著延长的能力。铜具有高延展性。
Hardness: Resistance to indentation, scratching, or surface wear. Diamond is extremely hard; aluminium is relatively soft.
硬度：抵抗压入、划痕或表面磨损的能力。金刚石极硬；铝相对较软。
Toughness: The ability to absorb energy and plastically deform without fracturing. Tough materials, like mild steel, are used where impact resistance is needed.
韧性：材料吸收能量并发生塑性变形而不断裂的能力。韧性材料如低碳钢用于需要抗冲击的场合。
Density: Mass per unit volume. It influences weight and buoyancy. Unit: kg/m³. Aluminium has a low density, useful for lightweight structures.
密度：单位体积的质量。它影响重量与浮力。单位 kg/m³。铝密度低，适用于轻质结构。
3. Structural Concepts | 结构概念
Structures must withstand various types of loads. Key terms describe how forces flow through members and how stability is achieved.
结构必须承受各类载荷。关键术语描述了力如何在构件中传递以及如何实现稳定。
Tension: A pulling force that tries to elongate a structural member. Cables in a suspension bridge experience tension.
拉力：试图拉长结构构件的力。悬索桥的缆索承受拉力。
Compression: A pushing force that shortens a member. Columns in a building are designed to resist compression.
压力：缩短构件的推力。建筑物中的柱子设计用于抵抗压力。
Shear: A force that tries to make two adjacent parts slide past each other, like scissors cutting paper. Rivets and bolts experience shear.
剪切力：试图使两个相邻部分相互滑动的力，如剪刀剪纸。铆钉和螺栓承受剪切力。
causes a beam to bend. It is calculated as force × perpendicular distance from a support.
弯矩：导致梁弯曲的内力矩。计算为力 × 距支点的垂直距离。
Factor of safety: The ratio of the material's failure stress to the allowable working stress. A higher factor means a more conservative, safer design.
安全系数：材料破坏应力与许用工作应力之比。较高的系数意味着更保守、更安全的设计。
Triangulation: The use of triangles in frameworks to create rigid structures. Triangles cannot change shape without altering side lengths, unlike rectangles.
三角形结构：在框架中使用三角形来形成刚性结构。三角形不像矩形那样可以不改变边长而改变形状。
4. Energy, Work and Power | 能量、功与功率
Energy and work are fundamental in all engineering systems. These terms quantify how machines perform tasks and transfer energy.
能量和功是所有工程系统的基础。这些术语量化机器如何执行任务和传递能量。
a distance. Work = force × distance moved in the direction of the force. Unit: joule (J).
功：力使物体沿力的方向移动一段距离时传递的能量。功 = 力 × 沿力方向移动的距离。单位：焦耳 (J)。
Energy: The capacity to do work. It exists in many forms: kinetic, potential, thermal, chemical, electrical. Unit: joule (J).
能量：做功的能力。它有多种形式：动能、势能、热能、化学能、电能。单位：焦耳 (J)。
is done or energy is transferred. Power = work / time. Unit: watt (W), where 1 W = 1 J/s.
功率：做功或能量传递的速率。功率 = 功 / 时间。单位：瓦特 (W)，1 W = 1 J/s。
) to input energy (or power), often expressed as a percentage. (Useful output/Input) × 100%.
效率：有用输出能量（或功率）与输入能量（或功率）之比，常以百分比表示。(有用输出 / 输入) × 100%。
red in an object due to its position or state. Gravitational potential energy = m × g × h.
势能：物体因其位置或状态而储存的能量。重力势能 = 质量 × 引力场强度 × 高度。
Kinetic energy: The energy an object possesses due to its motion. KE = ½ × m × v².
动能：物体由于运动而具有的能量。动能 = ½ × 质量 × 速度²。
5. Basic Electricity and Circuits | 基础电学与电路
Electrical systems are everywhere in modern engineering. Grasping the core vocabulary is essential for circuit analysis and electronics.
电气系统在现代工程中随处可见。掌握核心词汇对于电路分析和电子学至关重要。
Current: The flow of electric charge, measured in amperes (A). Conventionally, current flows from positive to negative, but electrons flow the opposite way.
电流：电荷的流动，单位安培 (A)。通常规定电流从正极流向负极，但电子流动方向相反。
Voltage: The electrical potential difference that drives current through a circuit, measured in volts (V). Often called electromotive force (EMF) when generated by a battery.
电压：驱动电流通过电路的电位差，单位伏特 (V)。当由电池产生时常称为电动势 (EMF)。
Resistance: Opposition to current flow, measured in ohms (Ω). Conductors have low resistance; insulators have very high resistance.
电阻：对电流流动的阻碍，单位欧姆 (Ω)。导体电阻低；绝缘体电阻极高。
Ohm's Law: Relates voltage, current, and resistance in a simple electrical circuit.
欧姆定律：简单电路中电压、电流和电阻的关系。
V = I × R
电压 (V) = 电流 (I) × 电阻 (R)
Series circuit: Components are connected end-to-end, so the same current flows through each. Total resistance is the sum of individual resistances.
串联电路：元件首尾相连，因此相同电流流过每个元件。总电阻为各个电阻之和。
Parallel circuit: Components are connected across common points, providing multiple current paths. The voltage across each branch is the same.
并联电路：元件连接在公共点之间，提供多条电流路径。各支路两端电压相同。
6. Mechanisms and Mechanical Advantage | 机构与机械利益
Mechanisms change the magnitude, direction, or type of motion. Mechanical advantage is a key concept for levers, gears, and pulleys.
机构改变运动的大小、方向或类型。机械利益是杠杆、齿轮和滑轮的关键概念。
input force in a mechanism. MA = Load / Effort. If MA > 1, the mechanism multiplies force.
机械利益：机构中输出力与输入力之比。MA = 负载 / 作用力。若 MA 大于 1，机构增力。
Lever: A rigid bar that pivots around a fixed point called the fulcrum. Levers are classified by the relative positions of effort, load, and fulcrum.
杠杆：绕固定支点转动的刚性杆。根据力、负载和支点的相对位置分为三类。
Gear ratio: The ratio of the number of teeth on output gear to input gear. A larger gear ratio increases output torque but reduces speed.
齿轮比：输出齿轮齿数与输入齿轮齿数之比。较大的齿轮比增加输出扭矩但降低转速。
Pulley: A wheel on an axle used with a rope or belt to transmit force and motion. A block and tackle system uses multiple pulleys for high MA.
滑轮：带有绳索或皮带的轮子，用于传递力和运动。滑轮组使用多个滑轮获得高机械利益。
e distance moved by the load. For ideal systems, VR = MA, but friction reduces efficiency.
速度比：作用力移动距离与负载移动距离之比。理想系统中 VR = MA，但摩擦会降低效率。
Efficiency of mechanism: Always less than 100% due to friction and energy losses. Efficiency = (MA / VR) × 100%.
机构效率：由于摩擦和能量损失，始终低于 100%。效率 = (MA / VR) × 100%。
7. The Engineering Design Process | 工程设计过程
Engineering isn't just about calculations; it follows a structured process from identifying a need to delivering a solution. The vocabulary reflects each stage.
工程不仅仅是计算；它遵循从确定需求到交付解决方案的结构化过程。术语反映了每个阶段。
Design brief: A concise statement that outlines the problem, constraints, and objectives of an engineering project. It sets the direction for all subsequent work.
设计纲要：概述工程问题、约束条件和目标的简明陈述。它为后续所有工作指明方向。
Specification: A detailed list of requirements that the final solution must meet, including performance, materials, size, cost, and safety criteria.
规格说明：最终方案必须满足的详细要求清单，包括性能、材料、尺寸、成本和安全标准。
Prototype: A first, often full-scale, model built to test a design concept. Prototypes help identify flaws before mass production.
原型：为测试设计概念而建造的第一个通常全尺寸的模型。原型有助于在批量生产前发现缺陷。
Iterative design: A cyclical process of designing, testing, evaluating, and refining. Each iteration improves the solution based on feedback.
迭代设计：设计、测试、评估、改进的循环过程。每次迭代根据反馈完善解决方案。
CAD (Computer-Aided Design): The use of computer software to create precise 2D or 3D models of components. CAD allows for easy modifications and simulations.
计算机辅助设计 (CAD)：使用计算机软件创建精确的二维或三维部件模型。CAD 便于修改和模拟。
Ergonomics: The study of how humans interact with products and environments, aiming to improve comfort, efficiency, and safety.
人机工程学：研究人类如何与产品和环境交互，旨在提升舒适性、效率和安全性。
8. Manufacturing Processes | 制造工艺
Turning a design into a physical product requires understanding of manufacturing techniques. Each process has distinct terminology.
将设计转化为实物需要了解制造技术。每种工艺都有独特的术语。
Casting: Pouring molten material into a mould where it solidifies into the desired shape. Sand casting and die casting are common methods.
铸造：将熔融材料倒入模具，在其中凝固成所需形状。砂型铸造和压铸是常见方法。
Machining: Removing material from a workpiece using cutting tools, such as turning, milling, and drilling. It achieves high precision.
机械加工：使用切削工具（如车削、铣削、钻孔）从工件上去除材料。可实现高精度。
Forming: Reshaping material without removing any, such as bending, forging, or rolling. The material's mass remains effectively constant.
成形：不削除材料的情况下重新塑造形状，如弯曲、锻造、轧制。材料质量基本不变。
Joining: Combining components using techniques like welding, soldering, brazing, or adhesives. Permanent and non-permanent joints exist.
连接：使用焊接、软钎焊、硬钎焊或粘合剂等技术组合部件。有永久和非永久连接之分。
Additive manufacturing (3D printing): Building parts layer by layer from digital models, often using plastics, resins, or metals. It reduces waste and allows complex geometries.
增材制造 (3D 打印)：从数字模型逐层构建零件，常使用塑料、树脂或金属。减少浪费并允许复杂几何形状。
Tolerance: The permissible limit of variation in a physical dimension. A tight tolerance means very little deviation is allowed, essential for interchangeable parts.
公差：物理尺寸的允许变化限度。严格的公差意味着允许极小的偏差，这对互换性零件至关重要。
9. Measurement, Units and Precision | 测量、单位与精度
Accurate measurement underpins all engineering work. Understanding SI units and instruments is necessary for quality control and communication.
精确测量是所有工程工作的基础。理解国际单位制和测量仪器对于质量控制和沟通至关重要。
SI units: The International System of Units, based on seven base units: metre (length), kilogram (mass), second (time), ampere (current), kelvin (temperature), mole (amount), candela (luminous intensity).
国际单位制 (SI)：基于七个基本单位：米 (长度)、千克 (质量)、秒 (时间)、安培 (电流)、开尔文 (温度)、摩尔 (物质的量)、坎德拉 (发光强度)。
Precision: How closely repeated measurements agree with each other. High precision means low random error, even if the average is not accurate.
精密度：重复测量值彼此接近的程度。高精密度意味着随机误差小，即使平均值不准确。
Accuracy: How close a measurement is to the true value. A measurement can be precise but not accurate if there is a systematic error.
准确度：测量值接近真实值的程度。如果存在系统误差，测量结果可能精密但不准确。
Vernier caliper: A measuring instrument used to take internal, external, and depth dimensions with typical precision of 0.02 mm or 0.001 inches.
游标卡尺：用于测量内径、外径和深度的仪器，典型精度为 0.02 mm 或 0.001 英寸。
Micrometer: A precision measuring tool for very small distances, often achieving 0.01 mm or better. It uses a calibrated screw mechanism.
千分尺：用于极小距离的精密测量工具，通常精度可达 0.01 mm 或更高。它使用校准螺杆机构。
Zero error: A systematic error that occurs when a measuring instrument shows a non-zero reading when the true value is zero. It must be corrected for all measurements.
零误差：当真实值为零时，测量仪器显示非零读数的系统误差。必须在所有测量中予以校正。
10. Health and Safety Terminology | 健康与安全术语
Engineering workshops and sites have inherent risks. Knowing safety terminology protects individuals and promotes a culture of awareness.
工程车间和现场存在固有风险。了解安全术语可保护个人并促进安全意识文化。
Risk assessment: The process of identifying hazards, evaluating the likelihood and severity of harm, and implementing control measures. Usually recorded on a formal document.
风险评估：识别危险、评估伤害可能性和严重性并实施控制措施的过程。通常记录在正式文件中。
Hazard: Anything with the potential to cause harm, such as rotating machinery, sharp edges, chemicals, or electricity.
危险源：任何可能造成伤害的事物，如旋转机械、锋利边缘、化学品或电气。
PPE (Personal Protective Equipment): Equipment worn to minimise exposure to hazards. Examples: safety glasses, hard hats, steel-toe boots, ear defenders.
个人防护装备 (PPE)：佩戴的用以尽量减少暴露于危险的装备。例如：护目镜、安全帽、钢头靴、耳罩。
Emergency stop: A red, mushroom-shaped button that immediately cuts power to machinery to prevent injury. Must be easily accessible and regularly tested.
紧急停止：一种红色蘑菇头按钮，可立即切断机器电源以防止伤害。必须易于触及并定期测试。
MSDS / SDS (Material Safety Data Sheet / Safety Data Sheet): A document that provides information about the properties, hazards, handling, storage, and emergency procedures for a chemical substance.
材料安全数据表 / 安全数据表 (MSDS/SDS)：提供关于化学物质的特性、危害、操作、储存和应急程序信息的文件。
Safe working load: The maximum load that a piece of lifting equipment or structure is designed to carry safely. Exceeding this can cause catastrophic failure.
安全工作载荷：起重设备或结构设计所能安全承载的最大载荷。超过此载荷可能导致灾难性失效。
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