📚 Vocabulary & Terminology Quick Memorisation Guide | 词汇术语速记指南
Engineering at Year 12 introduces a wealth of specialised vocabulary that can feel overwhelming. This guide is designed to help you commit essential terms to memory using mnemonics, word roots, and conceptual links – turning abstract jargon into familiar ideas you can recall under exam pressure.
Year 12 工程学科引入了大量专业词汇，初看可能令人望而生畏。本指南旨在通过记忆术、词根联想和概念链接，帮助你将核心术语牢记于心，把抽象的行话变成在考试压力下也能轻松回忆的熟悉概念。
1. Mechanics Essentials | 力学基础术语
Force (F), measured in newtons (N), is any interaction that changes an object's motion. Remember Newton's second law: F = ma. Think of a shopping trolley – the harder you push (force), the faster it accelerates. The word 'force' shares roots with 'fort' (strong), suggesting a push that makes things move.
力 (F)，单位为牛顿 (N)，是改变物体运动状态的任何相互作用。记住牛顿第二定律：F = ma。想象一辆购物车——推得越用力 (力越大)，它加速越快。单词 'force' 与 'fort' (堡垒) 同源，暗含一股让物体运动的强劲推力。
Moment (M) is the turning effect of a force: M = F × d (perpendicular distance from pivot). Mnemonic: 'Moment' sounds like 'movement' – handle gives a larger moment for the same force, making it easier to turn a stubborn nut.
力矩 (M) 是力的转动效应：M = F × d (到支点的垂直距离)。记忆窍门：'Moment'与'movement'发音相似——它正是引起旋转的推手。想象使用扳手：同样的力，手柄越长力矩越大，顽固的螺母越容易转动。
Equilibrium occurs when the resultant force and resultant moment on a body are both zero. Visualise a see-saw perfectly balanced: the sum of clockwise moments equals the sum of anticlockwise moments. 'Equi-' means equal, 'librium' relates to balance (like Libra, the scales).
平衡 发生在物体所受的合力和合力矩均为零时。想象一架完全平衡的跷跷板：顺时针力矩之和等于逆时针力矩之和。'Equi-' 表示相等，'librium' 与平衡有关 (如天秤座 Libra)。
2. Material Properties | 材料性质术语
Stress (σ) e a rope under tension: the internal resistance divided by cross-sectional area is stress. Link the word 'stress' to 'stretch' – both start with 'str'. A tensile stress stretches the material, a compressive stress squashes it.
应力 (σ) 是单位面积上的力：σ = F/A。想象一根受拉的绳子：内部分布的抗力除以截面积即为应力。将'stress'与'stretch'联系起来——两者都以'str'开头。拉应力使材料伸长，压应力使其缩短。
Strain (ε) is the extension per original length: ε = ΔL/L₀. It has no units. Think of strain as 'stretch ratio'. To memorise: 'strain' contains 'train' – follows stress. For elastic materials, strain is recoverable; plastic strain is permanent.
应变 (ε) 是单位原长的伸长量：ε = ΔL/L₀，无量纲。可将应变看作'拉伸比'。记忆方法：'strain'包含'train'——像拉着一列思维列车，变形紧随应力之后。弹性应变可恢复；塑性应变是永久的。
Young's modulus (E) = stress/strain in the linear elastic region. It measures stiffness. Remember: 'Young' suggests freshness and springiness – a stiff young bone. E is constant for a given material up to the limit of proportionality.
杨氏模量 (E) = 线弹性阶段的应力/应变，衡量刚度。记忆点：'Young' 让人联想到青春与弹性——高模量意味着材料难以拉伸，如同坚硬的年轻骨骼。在比例极限内，E 对给定材料是常数。
| Term (EN) | 中文术语 | Quick memory aid |
|---|---|---|
| Ductile | 延性 | Ductile -> 'duct' as in a pipe that can be drawn into a wire. |
| Brittle | 脆性 | Brittle like a biscuit – snaps without warning. |
| Toughness | 韧性 | Absorbs energy before fracture; area under stress-strain curve. |
| Hardness | 硬度 | Resistance to indentation. Hard = difficult to scratch. |
3. Electrical Fundamentals | 电学基础术语
Current (I) f flow of charge: I = ΔQ/Δt, measured in amperes (A). Picture water flowing through a pipe – current is how much charge passes per second. Mnemonic: 'I' for 'intensity' of flow. Remember conventional current flows from positive to negative.
电流 (I) 是电荷流动的速率：I = ΔQ/Δt，单位为安培 (A)。想象水流过管道——电流就是每秒通过多少电荷。助记：'I' 代表流动的'强度'。记住，传统电流方向是从正极到负极。
Voltage (V) is the energy transferred per unit charge (V = W/Q). Think of voltage as electrical 'pressure' that pushes current around the circuit. The term 'potential difference' ence in electric potential between two points. A 9V battery provides 9 joules per coulomb.
电压 (V) 是每单位电荷转移的能量 (V = W/Q)。把电压想象成推动电荷绕电路流动的电'压力'。'电势差'一词提醒我们它是两点间电势的差异。一块 9V 电池每库仑提供 9 焦耳能量。
Resistance (R) opposes current flow. Ohm's law: V = IR. For a fixed voltage, higher resistance means lower current. Remember 'R' = restriction. Use the phrase 'Very Important Resistor' to recall V = IR: Voltage = Current × Resistance.
电阻 (R) 阻碍电流流动。欧姆定律：V = IR。电压固定时，电阻越大电流越小。把'R'联想为'restriction'(限制)。用句子'Vicky Is Really'记 V = I × R。
4. Energy, Work & Power | 能量、功与功率
Work done (W) force: W = Fd cosθ. When you lift a box vertically, work = weight × height. The concept of 'work' in physics means energy transferred mechanically. If there is no movement, no work is done – even if you are exhausted holding a heavy bag still.
功 (W) = 力 × 沿力方向移动的距离：W = Fd cosθ。竖直提起箱子时，功 = 重量 × 高度。物理中的'功'指机械传递的能量。如果没有移动，就不做功——即便你举着重包纹丝不动感到筋疲力尽。
Kinetic energy (KE) v². It is the energy of motion. The v² term means doubling speed quadruples kinetic energy – which explains why high-speed crashes are so devastating. To memorise, sing 'half-em-vee-squared' like a jingle.
动能 (KE) = ½mv²。它是运动具有的能量。v² 意味着速度加倍，动能变为四倍——这解释了为什么高速碰撞破坏力极强。记忆时，可将'½mv²'像顺口溜一样念叨。
Power (P) mount of work done faster means more power. Also P = Fv for constant velocity motion. Link 'power' to 'powerful engine' – how quickly it delivers energy.
功率 (P) 是做功的快慢：P = W/t，单位为瓦特 (W)。做同样的功，时间越短功率越大。匀速运动时还有 P = Fv。将'power'与'强劲的发动机'联系起来——指它输出能量有多快。
5. Kinematics in a Nutshell | 运动学精要
Displacement (s) is a vector quantity: the straight-line distance in a given direction from start to finish. Unlike distance, displacement can be zero if you return to the start. Picture a 400 m running track: after one lap your distance is 400 m but displacement is 0.
位移 (s) 是矢量：从起点到终点的直线距离，并带有方向。与路程不同，如果返回起点位移可以为零。想象 400 米跑道：跑完一圈路程为 400 米，但位移为 0。
Velocity (v) is rate of change of displacement, and acceleration (a) of change of velocity. Use the SUVAT equations for constant acceleration. A fun mnemonic: 'Violet Uses A Tractor' for v = u + at; 'Silly U Are Very Tired' maybe for s = ut + ½at². The key is that these only apply when a is constant.
速度 (v) 是位移变化率，加速度 (a) 是速度变化率。匀加速直线运动使用 SUVAT 方程。一个趣味记忆法：'小紫开着一辆拖拉机' 记 v = u + at；'傻傻的你很累' 或许记 s = ut + ½at²。关键是这些公式仅在加速度恒定时适用。
v = u + at s = ut + ½at² v² = u² + 2as
v = u + at s = ut + ½at² v² = u² + 2as
6. Structural Analysis | 结构分析术语
Tension is a pulling force that tries to elongate a member; compression is a pushing force that shortens it. In a truss, members are either ties (in tension) or struts (in compression). Think of a tug-of-war rope – it experiences tension. A table leg experiences compression.
拉伸 是试图使构件伸长的拉力；压缩 是使其缩短的推力。在桁架中，构件要么是拉杆 (受拉) 要么是压杆 (受压)。想象拔河绳——它承受拉力。桌腿则承受压力。
Bending moment at a section is the internal moment that resists bending, calculated by summing moments to one side of the section. It is positive when causing 'sagging' (smile shape). Visualise a simply supported beam with a central load – the bending moment is maximum in the middle, where the beam wants to bend most.
弯矩 是截面处抵抗弯曲的内力矩，通过取截面一侧力矩之和计算。使梁下凹 (微笑形) 时为正。想象一根简支梁受集中载荷——弯矩在跨中最大，那里是梁最想弯曲的地方。
Shear force is the internal force perpendicular to the beam axis, trying to cut it. On a shear force diagram, a sudden jump occurs where a point load acts. 'Shear' like scissors – it makes parts slide past each other.
剪力 是垂直于梁轴线的内力，试图将其剪断。在剪力图上，集中力作用处会产生突跳。'Shear'就像剪刀——它使各部分相互错动。
7. Manufacturing Processes | 制造工艺术语
Casting: pouring molten metal into a mould and letting it solidify. Think of pouring jelly into a mould – the shape is replicated. Sand casting uses expendable sand moulds; die casting uses reusable metal moulds under high pressure.
铸造：将熔融金属浇入铸型并让其凝固。想象把果冻倒入模具——形状被复制。砂型铸造使用一次性砂模；压力铸造使用可重复使用的金属模具，在高压下完成。
Forging shapes metal by compressive forces, often with a hammer or press. It refines the grain structure and improves strength. The blacksmith's hammering is a classic example. 'Forge' also means to shape something strongly – like forging a friendship.
锻造 通过压缩力 (锤击或压机) 使金属成形。它细化晶粒组织并提高强度。铁匠的锤打是经典例子。'Forge'也有'锤炼、缔造'之意——如缔造友谊。
Machining removes material with cutting tools to achieve the desired geometry. Common operations: turning, milling, drilling. Remember 'machine' removes the excess – it cuts away the unwanted, like a sculptor revealing a statue from a block.
机械加工 用切削刀具去除材料以获得所需几何形状。常见操作：车削、铣削、钻削。记住'machine'就是切除多余部分——它切掉不要的，如同雕塑家从石块中雕出雕像。
8. Engineering Drawing & Tolerances | 工程制图与公差
Orthographic projection shows a 3D object by 2D views (front, top, side) arranged in standard positions. The word 'ortho' means straight or correct, 'graphic' means drawing – so it is a 'correct drawing' projection. First-angle and third-angle are two conventions; remember the symbol of the truncated cone to tell them apart.
正投影 通过标准排列的二维视图 (前视图、俯视图、侧视图) 表达三维物体。'Ortho' 意为'正的、直的'，'graphic' 意为'图画'——因此是'正确画法'投影。第一角与第三角投影是两种规则；用截锥符号来区分它们。
Dimensioning rules: dimension lines are thin, with arrowheads, numerals placed above the line. Chain dimensioning and datum dimensioning are two approaches. Avoid over-dimensioning – each feature should be defined only once. Think: 'dimension like a recipe, give exactly the information needed to build it'.
尺寸标注 规则：尺寸线为细实线，带箭头，数字标注在线条上方。链式标注和基准标注是两种方式。避免过约束——每个特征只应定义一次。联想：'标注如食谱，给出制作所需的准确信息'。
Tolerance is the allowable variation in a dimension. A hole might be specified as Ø20 H7, where H7 indicates the tolerance grade. 'Limits' give the maximum and minimum sizes. To memorise, recall that every process has natural variation; tolerance defines the acceptable range of imperfection.
公差 是尺寸允许的变动量。一个孔可能标注为 Ø20 H7，其中 H7 表示公差等级。'极限尺寸'给出最大和最小实体尺寸。记忆方法：任何工艺都有固有变异；公差定义了可接受的不完美范围。
9. Measurement & Error | 测量与误差术语
Accuracy is how close a measurement is to the true value; precision is how closely repeated measurements agree with each other. Think of a dartboard: accurate hits the bullseye, precise groups tightly together (even if off-target). High precision does not guarantee high accuracy.
准确度 指测量值与真值的接近程度；精密度 指多次测量值之间的一致性。想象飞镖靶：准确意味着中靶心，精密是集中在一处 (哪怕偏离靶心)。高精密度不保证高准确度。
Systematic error biases all readings in one direction, often due to faulty equipment (e.g. a zero error). Random error scatters readings unpredictably, caused by environmental fluctuations or human judgement. Mnemonic: 'Systematic shifts everything the same way – like a clock that is always 5 minutes fast.'
系统误差 使所有读数朝同一方向偏离，常因设备缺陷 (例如零点误差) 引起。随机误差 使读数不可预测地分散，由环境波动或人为判断导致。记忆法：'系统误差让一切朝同一方向偏移——就像一只总是快 5 分钟的钟。'
Uncertainty it is ± half the smallest division. Record a measurement as value ± absolute uncertainty.
不确定度 表达测量结果的存疑范围。数字仪器的不确定度通常为 ± 最小有效数字；模拟刻度为 ± 最小分度值的一半。记录测量结果时用 数值 ± 绝对不确定度。
10. Thermodynamics Primer | 热力学入门术语
Internal energy (U) is the sum of all microscopic kinetic and potential energies of the particles in a system. Heating raises internal energy by making particles vibrate faster. Visualise a gas: its internal energy increases when you supply heat or do work on it.
内能 (U) 是系统内所有粒子微观动能与势能的总和。加热使粒子振动加快，从而提升内能。想象一股气体：当你对其加热或做功时，其内能增加。
Specific heat capacity (c) gh specific heat capacity (4200 J/kg·K), which is why it is used in cooling systems. Remember 'c' stands for capacity to store heat.
比热容 (c) 是使 1 kg 物质升温 1 K 所需的能量：Q = mcΔθ。水的比热容很高 (4200 J/kg·K)，这就是它被用于冷却系统的原因。记 'c' 为储热能力的 capacity。
First law of thermodynamics ystem, W is work done by the system. Think of it as an energy bank account: internal energy change equals deposits (heat in) minus withdrawals (work out). The sign convention is crucial.
热力学第一定律：ΔU = Q - W，其中 Q 为传入系统的热量，W 为系统对外作的功。把它想象成一个能量银行账户：内能变化等于存入 (吸热) 减去取出 (对外做功)。符号惯例至关重要。
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