📚 Year 9 Edexcel Engineering: Vocabulary & Terminology Fast-Track Guide | Year 9 Edexcel 工程：词汇术语速记指南
Mastering key engineering terminology is the first step towards thinking like an engineer. This guide covers the essential vocabulary you will encounter in Year 9 Edexcel Engineering, arranged by topic clusters to help you memorise definitions quickly and apply them in design, analysis, and practical tasks. Each term is presented with a concise explanation and a Chinese translation, followed by context-rich examples that link directly to the Edexcel curriculum.
掌握关键工程术语是像工程师一样思考的第一步。本指南涵盖 Year 9 Edexcel 工程课程中你会遇到的核心词汇，按主题聚类编排，帮助你快速记忆定义，并在设计、分析和实践操作中灵活运用。每个术语都配有简洁的英文解释与中文翻译，并提供紧扣 Edexcel 大纲的实例说明。
1. Forces and Motion Basics | 力与运动基础
In engineering, understanding forces is fundamental. A force is a push or a pull acting on an object, measured in newtons (N). The mass of an object is the amount of matter it contains (kg), while its weight ulated as weight = mass × gravitational field strength (on Earth, approximately 9.8 N/kg). Friction is a force that opposes motion between two surfaces in contact, and engineers often aim to reduce it using lubrication or bearings.
在工程中，理解力是基础。力是作用在物体上的推或拉，单位是牛顿（N）。物体的质量是它所含物质的多少（kg），而重量是由于重力产生的力，计算方式为 重量 = 质量 × 重力场强度（地球上约为 9.8 N/kg）。摩擦力是阻碍两个接触表面相对运动的力，工程师通常利用润滑或轴承来减小摩擦。
Resultant force is the single force that has the same effect as all the forces acting on an object combined. When forces are balanced, the object remains stationary or moves at a constant speed; when unbalanced, the object accelerates in the direction of the resultant force. Equilibrium describes a state where all forces and moments are balanced.
合力是与作用在物体上所有力总和效果相同的单一力。当力平衡时，物体保持静止或匀速运动；当力不平衡时，物体会沿合力方向加速。平衡描述的是所有力和力矩都相互抵消的状态。
| English Term | 中文术语 | Symbol / Unit |
|---|---|---|
| Force | 力 | N |
| Mass | 质量 | kg |
| Weight | 重量 | N |
| Friction | 摩擦力 | N |
2. Mechanical Properties of Materials | 材料的力学性能
Selecting the right material depends on its mechanical properties. Hardness is the ability of a material to resist indentation or scratching; diamond is extremely hard. Toughness refers to a material's ability to absorb energy before fracturing – think of a rubber tyre absorbing shocks. In contrast, brittleness describes materials that break with little plastic deformation, such as glass.
选择合适的材料取决于其力学性能。硬度是材料抵抗压痕或刮擦的能力；金刚石极硬。韧性指材料在断裂前吸收能量的能力——想象一下橡胶轮胎吸收冲击。相反，脆性描述的是几乎没有塑性变形就断裂的材料，如玻璃。
Strength is the capacity to withstand an applied load without failure. Tensile strength measures resistance to pulling forces, while compressive strength deals with pushing forces. Ductility is the ability of a material to be drawn into wires (e.g. copper), and malleability is the ability to be hammered or rolled into thin sheets (e.g. aluminium foil).
强度是承受外加载荷而不失效的能力。抗拉强度衡量抵抗拉伸力的能力，抗压强度则对应推力。延展性是材料被拉成丝的能力（如铜），而可锻性是被锤打或轧制成薄板的能力（如铝箔）。
Elasticity allows a material to return to its original shape after the load is removed, as seen in springs. Plasticity causes permanent deformation – once bent, a paper clip stays bent. The transition between these behaviours is marked by the yield point.
弹性使材料在载荷移除后能恢复原状，如弹簧。而塑性导致永久变形——回形针弯折后就保持弯曲。两者之间的转变由屈服点标志。
3. Common Engineering Materials | 常见工程材料
Materials are grouped into families. Metals (ferrous, like steel and cast iron, and non‑ferrous, like aluminium and copper) are typically strong, good conductors of heat and electricity. Polymers (plastics) are lightweight, can be moulded easily, and are divided into thermoplastics (can be reheated and reshaped, e.g. acrylic) and thermosets (set permanently once formed, e.g. epoxy resin).
材料按家族分类。金属（有色金属如钢和铸铁，非有色金属如铝和铜）通常强度高，是热和电的良导体。聚合物（塑料）重量轻、易于成型，分为热塑性塑料（可再加热重塑，如亚克力）和热固性塑料（成型后永久固化，如环氧树脂）。
Ceramics (e.g. brick, porcelain) are hard, brittle, and resistant to high temperatures, making them suitable for furnace linings. Composites combine two or more materials to gain advantages – fibreglass consists of glass fibres in a polymer matrix, offering high strength with low weight. Smart materials change their properties in response to external stimuli; a shape‑memory alloy (e.g. Nitinol) returns to a preset shape when heated.
陶瓷（如砖、瓷）硬而脆，耐高温，适用于炉衬。复合材料组合两种或更多材料来获得优势——玻璃纤维由玻璃纤维嵌入聚合物基体中，提供高强度与低重量。智能材料能响应外部刺激改变属性；形状记忆合金（如镍钛诺）加热时返回预设形状。
4. Structural Actions & Loads | 结构作用与载荷
Components in a structure experience different types of loads. Tension stretches a member, placing it in tension (e.g. a cable in a suspension bridge). Compression squeezes a member, shortening it (e.g. columns supporting a floor). Shear forces act parallel to a surface, as when a rivet joins two plates that slide against each other. Torsion twists a member about its axis, seen in drive shafts.
结构中的部件承受不同类型的载荷。拉伸使构件伸长，处于受拉状态（如悬索桥的缆索）。压缩挤压构件使其缩短（如支撑楼板的柱子）。剪切力平行于表面作用，例如铆钉连接两块相对滑动的板。而扭转使构件绕轴线扭曲，见于传动轴。
Bending causes a beam to curve under transverse loads, producing both tensile and compressive stresses across its section. The neutral axis is the line where stress is zero. A moment × perpendicular distance from the pivot; equilibrium of moments is vital in lever systems.
弯曲使梁在横向载荷下弯曲，截面内同时产生拉应力和压应力。中性轴是应力为零的线。力矩是力的转动效应，计算为力 × 到支点的垂直距离；力矩平衡在杠杆系统中至关重要。
5. Measurement Tools & Quality Control | 测量工具与质量控制
Precision in engineering relies on accurate measurement. A vernier caliper measures internal and external dimensions as well as depths, often to ±0.02 mm. A micrometer offers even finer resolution, typically ±0.01 mm, and is used for diameters and thicknesses. The multimeter is an electronic tool measuring voltage (V), current (A), and resistance (Ω).
工程中的精度依赖于准确测量。游标卡尺可测量内、外尺寸及深度，精度通常达 ±0.02 mm。千分尺提供更精细的分辨率，一般为 ±0.01 mm，用于直径和厚度测量。万用表是测量电压（V）、电流（A）和电阻（Ω）的电子工具。
Tolerance nsioned 20.00 ±0.05 mm must measure between 19.95 mm and 20.05 mm to pass quality control. Calibration checks an instrument’s accuracy against a known standard, while systematic error causes readings to be consistently offset.
公差是物理尺寸允许的变动范围。一个标注为 20.00 ±0.05 mm 的零件，必须测量在 19.95 mm 至 20.05 mm 之间才能通过质量控制。校准是将仪器比对已知标准以检查精度，而系统误差会导致读数持续偏倚。
| Tool | 工具 | Typical Accuracy |
|---|---|---|
| Vernier Caliper | 游标卡尺 | ±0.02 mm |
| Micrometer | 千分尺 | ±0.01 mm |
| Multimeter | 万用表 | Varies (e.g. ±0.5% DCV) |
6. Electrical Fundamentals | 电学基础
Electricity is the flow of charge. Current (I) is the rate of flow of electric charge, measured in amperes (A). Voltage (V), or potential difference, is the energy transferred per unit charge, measured in volts. Resistance (R) opposes the flow of current, measured in ohms (Ω). These three quantities are linked by Ohm's law: V = I × R.
电是电荷的流动。电流（I）是电荷流动的速率，单位为安培（A）。电压（V），即电势差，是每单位电荷传输的能量，单位为伏特。电阻（R）阻碍电流流动，单位为欧姆（Ω）。这三个量通过欧姆定律关联：V = I × R。
A series circuit has only one path for current; components share the voltage but carry the same current. A parallel circuit offers multiple paths; the voltage across each branch is the same, while currents split. Power (P), measured in watts (W), can be calculated as P = V × I. AC (alternating current) changes direction periodically, whereas DC (direct current) flows steadily in one direction.
串联电路只有一条电流路径；元件分压但电流相同。并联电路提供多条路径；各支路电压相同，而电流分流。功率（P），单位为瓦特（W），计算公式为 P = V × I。交流电（AC）周期性改变方向，而直流电（DC）稳定地单向流动。
7. Mechanical Power Transmission | 机械传动
Power can be transmitted mechanically through gears, pulleys, levers, and linkages. A gear is a toothed wheel that meshes with another to change speed, torque, or direction. The gear ratio is the ratio of the number of teeth on the driven gear to the number on the driver; it determines whether output speed increases or decreases.
动力可以通过齿轮、带轮、杠杆和连杆机构进行机械传递。齿轮是带齿的轮，与另一齿轮啮合以改变转速、扭矩或方向。齿轮比是从动齿轮齿数与主动齿轮齿数之比，它决定输出转速是增大还是减小。
A pulley system uses a rope and wheel to lift loads; adding pulleys increases mechanical advantage (MA), the ratio of load force to effort force. A lever s on a fulcrum, with MA = distance from effort to fulcrum ÷ distance from load to fulcrum. Belt and chain drives connect shafts over larger distances.
滑轮组利用绳索和轮子提升负载；增加滑轮数量可提高机械效益（MA），即负载力与作用力之比。杠杆绕支点转动，MA = 施力点到支点距离 ÷ 负载到支点距离。带传动和链传动则用来在较长距离间连接轴。
8. Manufacturing Processes | 制造工艺
Shaping materials requires specific processes. Casting involves pouring molten metal into a mould cavity; once solidified, the casting is removed. Forging shapes metal using compressive forces, often while hot, improving its strength. Welding joins materials by melting the interface, sometimes with a filler rod, to create a permanent bond.
材料成型需要特定的工艺。铸造是将熔融金属浇入模腔，凝固后取出铸件。锻造利用压缩力（通常在热态下）使金属成型，可提高其强度。焊接通过熔化接合面（有时用焊条）来形成永久连接。
Soldering is similar to welding but at lower temperatures, commonly used to attach electronic components to circuit boards using solder. Machining removes material with cutting tools – key operations include turning (on a lathe) and milling (using a rotating cutter). Additive manufacturing (3D printing) builds objects layer by layer, enabling complex geometries.
软钎焊类似焊接但温度较低，通常使用焊料将电子元件固定到电路板上。机加工使用刀具去除材料——关键操作包括车削（在车床上）和铣削（使用旋转刀具）。增材制造（3D打印）逐层构建物体，可实现复杂的几何形状。
9. Health & Safety Terminology | 健康与安全术语
Safety is paramount in workshops. PPE (Personal Protective Equipment) includes safety glasses, steel‑toe boots, gloves, and ear defenders. A hazard is anything with the potential to cause harm (e.g. a sharp blade), while a risk is the likelihood that harm will occur and the severity of that harm. Risk assessment identifies hazards, evaluates risks, and introduces control measures.
在车间中安全至关重要。PPE（个人防护装备）包括安全眼镜、钢头鞋、手套和耳罩。危害是任何可能造成伤害的事物（如锋利刀刃），而风险是伤害发生的可能性及其严重程度。风险评估识别危害、评价风险并引入控制措施。
COSHH (Control of Substances Hazardous to Health) regulations require employers to control chemicals, fumes, and dust. The risk hierarchy prioritises eliminating a hazard over using PPE. Manual handling covers lifting, lowering, and carrying – correct technique uses leg muscles, not the back. Emergency signage uses standard colours: red for prohibition, yellow for warning, green for safe routes.
COSHH（有害健康物质控制）法规要求雇主控制化学品、烟雾和粉尘。风险控制层级优先考虑消除危害，而非仅使用 PPE。人工搬运涵盖提升、降低和搬运——正确技巧使用腿部肌肉而非背部。紧急标志使用标准颜色：红色禁止、黄色警告、绿色安全通道。
10. Engineering Drawings & CAD | 工程制图与计算机辅助设计
Technical drawings communicate design intent. Orthographic projection shows a 3D object using several 2D views (front, top, right‑side). An isometric drawing represents the object with axes at 120°, giving a pictorial view. Dimensions are annotated in millimetres, and scale indicates the ratio of drawing size to real size.
技术图纸传达设计意图。正交投影使用多个二维视图（主视图、俯视图、右视图）来展示三维物体。等轴测图以 120° 轴呈现立体图。标注尺寸使用毫米，比例表示图纸尺寸与真实尺寸之比。
CAD (Computer‑Aided Design) software creates precise digital models, enabling easy modifications. CAM (Computer‑Aided Manufacturing) uses those CAD files to control machinery like CNC routers or 3D printers. Rendering produces realistic images by simulating materials and lighting. Exploded diagrams show parts separated but aligned, clarifying assembly sequences.
CAD（计算机辅助设计）软件创建精确的数字模型，便于修改。CAM（计算机辅助制造）使用这些 CAD 文件来控制 CNC 雕刻机或 3D 打印机等设备。渲染通过模拟材质和光照生成逼真图像。分解图将零件分开但对齐展示，阐明装配顺序。
11. Key Engineering Equations & Symbols | 关键工程公式与符号
Several equations are used repeatedly. Weight: W = m × g (g = 9.8 N/kg). Ohm's law: V = I × R. Power in electrical circuits: P = V × I. Mechanical advantage for levers: MA = effort distance ÷ load distance. Gear ratio: GR = number of teeth on driven gear ÷ number of teeth on driver. Efficiency: η = (useful output energy ÷ total input energy) × 100%.
有些公式会反复使用。重量：W = m × g（g = 9.8 N/kg）。欧姆定律：V = I × R。电路功率：P = V × I。杠杆机械效益：MA = 施力距离 ÷ 负载距离。齿轮比：GR = 从动齿轮齿数 ÷ 主动齿轮齿数。效率：η =（有用输出能量 ÷ 总输入能量）× 100%。
stress (σ = F/A), and ε (epsilon) for strain (ε = change in length/original length). Young's modulus E = stress ÷ strain describes material stiffness. These relationships form the foundation of structural calculations.
常用符号包括 F 表示力，A 表示面积，σ（西格玛）表示应力（σ = F/A），ε（艾普西隆）表示应变（ε = 长度变化/原始长度）。杨氏模量 E = 应力 ÷ 应变 描述材料刚度。这些关系构成结构计算的基础。
12. Revision Strategies & Terminology Retention | 复习策略与术语记忆
To retain these terms effectively, create flashcards with the English term on one side and the Chinese translation plus a simple diagram on the reverse. Use the Feynman technique: explain a concept out loud as if teaching someone else. Group words by topic (e.g., all force‑related terms) and build mind maps to see connections. Practise reading engineering drawings and describing them using the precise vocabulary you have learned.
要有效记住这些术语，可制作抽认卡，一面写英文术语，另一面写中文翻译并配上简单示意图。使用费曼技巧：像教别人一样大声解释概念。按主题归类（如所有与力相关的词），并构建思维导图以看清联系。练习阅读工程图纸，并用你所学的精确词汇描述它们。
Regularly apply terms in context – write short design briefs or analysis paragraphs that incorporate at least five new words. Review past Edexcel Year 9 worksheets and identify any unfamiliar vocabulary. Consistent, bite‑sized revision sessions are far more effective than cramming, so aim for 15–20 minutes daily rather than hours once a week.
经常在语境中运用术语——写简短的设计任务书或分析段落，至少包含五个新词。复习以往的 Edexcel Year 9 作业，找出任何不熟悉的词汇。持续的、碎片化的复习远比突击背诵有效，因此每天安排 15–20 分钟，而非每周一次数小时。
Published by TutorHao | Engineering Revision Series | aleveler.com
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