📚 Year 8 WJEC Engineering: Summer Preparation and Bridging Course | WJEC 工程学八年级暑期预习与衔接课程
Welcome to your summer engineering preparation course! This guide is designed to help you bridge the gap between Year 8 and Year 9 WJEC Engineering. Whether you are catching up or getting ahead, you will explore key topics such as the design process, materials, forces, electronics and sustainability. Each section presents clear explanations in English and Chinese, followed by practical ideas you can try at home. Let’s build the foundations for becoming a future engineer.
欢迎参加你的暑期工程预习课程！本指南旨在帮助你衔接八年级和九年级 WJEC 工程学的内容。无论你是想巩固知识还是提前学习，你都将探索设计过程、材料、力、电子和可持续发展等关键主题。每个部分都用中英双语进行清晰讲解，并附有可以在家实践的活动创意。让我们为成为未来的工程师打下基础。
1. What is Engineering and Why Does It Matter? | 什么是工程学，为什么它很重要？
Engineering is the creative application of science and mathematics to design, build and test solutions to real-world problems. From the smartphone in your pocket to the bridge you cross, engineering shapes our daily lives. Engineers work across many specialisms, combining technical knowledge with practical skills.
工程学是科学和数学的创造性应用，用于设计、建造和测试解决现实世界问题的方案。从你口袋里的智能手机到你经过的桥梁，工程学塑造了我们的日常生活。工程师在许多专业领域工作，将技术知识与实践技能相结合。
1. Civil engineers design infrastructure: bridges, tunnels, water supply systems.
1. 土木工程师设计基础设施：桥梁、隧道、供水系统。
2. Mechanical engineers develop machines, vehicles and manufacturing processes.
2. 机械工程师开发机器、车辆和制造工艺。
3. Electrical engineers work with power generation, circuits and control systems.
3. 电气工程师从事发电、电路和控制系统的工作。
4. Aerospace engineers design aircraft, satellites and space exploration technology.
4. 航空航天工程师设计飞机、卫星和太空探索技术。
5. Software engineers write code for apps, robotics and artificial intelligence.
5. 软件工程师为应用程序、机器人和人工智能编写代码。
Understanding what engineering involves will help you see how each subject you study connects to real careers. This course focuses on the broad engineering ideas that underpin the WJEC curriculum.
了解工程学涉及的内容将帮助你看到你学习的每门学科如何与真实的职业联系起来。本课程侧重于支撑 WJEC 课程的广泛工程理念。
2. The Engineering Design Cycle | 工程设计循环
Every engineered product starts with a problem. The engineering design cycle provides a structured way to move from an initial idea to a final, tested solution. The main stages are: identify the need, research, brainstorm, develop a prototype, test and evaluate, then improve and repeat.
每一件工程产品都始于一个问题。工程设计循环提供了一种结构化的方法，从最初的想法转向经过测试的最终解决方案。主要阶段包括：明确需求、调研、头脑风暴、开发原型、测试和评估，然后改进并循环重复。
Step 1 – Identify the problem: What does the user need? Write a clear design brief.
第 1 步 – 明确问题：用户需要什么？撰写一份清晰的设计概要。
Step 2 – Research: Look at existing products, materials and scientific principles.
第 2 步 – 调研：研究现有产品、材料和科学原理。
Step 3 – Generate ideas: Sketch multiple solutions and select the most promising one.
第 3 步 – 生成创意：画出多种解决方案的草图，选出最有前景的一个。
Step 4 – Build a prototype: Create a working model using simple materials.
第 4 步 – 建立原型：用简单的材料制作一个工作模型。
Step 5 – Test and evaluate: Does it meet the design brief? Record data and observations.
第 5 步 – 测试与评估：它满足设计概要的要求吗？记录数据和观察结果。
Step 6 – Improve: Make changes and test again. This is iterative design.
第 6 步 – 改进：做出更改并再次测试。这就是迭代设计。
In Year 9 and GCSE Engineering, you will use this cycle in practical projects. During the summer, try designing a simple paper bridge and follow all the stages.
在九年级和 GCSE 工程学中，你将在实践项目中使用这一循环。暑假期间，可以尝试设计一座纸桥并经历所有阶段。
3. Health and Safety: Staying Safe in the Workshop | 健康与安全：在工作室里保持安全
Safety is the number one priority in any engineering environment. Before you pick up a tool or handle a material, you must understand the risks and how to control them. Risk assessments are used to identify hazards and decide on precautions.
在任何工程环境中，安全都是第一位的。在你拿起工具或处理材料之前，你必须了解风险以及如何控制它们。风险评估用于识别危险并确定预防措施。
A hazard is anything that could cause harm, such as a sharp blade or hot surface. A risk is the likelihood that harm will occur. You reduce risk by wearing protective equipment and following safe procedures.
危害是指任何可能造成伤害的事物，例如锋利的刀片或热表面。风险是指伤害发生的可能性。你通过佩戴防护装备和遵守安全程序来降低风险。
Common workshop safety rules include:
常见的工作室安全规则包括：
– Always wear safety goggles when cutting or drilling.
– 在进行切割或钻孔时始终佩戴护目镜。
– Tie back long hair and do not wear loose clothing near moving machinery.
– 将长发束起，在转动机器附近不穿宽松衣物。
– Keep your work area clean and free of clutter.
– 保持工作区域清洁，无杂物。
– Know the location of emergency stop buttons and fire extinguishers.
– 知道紧急停止按钮和灭火器的位置。
– Never operate a machine unless you have been properly trained.
– 除非经过正确培训，否则切勿操作机器。
Familiarise yourself with the hazard symbols used on chemicals and materials. Recognise the signs for flammable, corrosive, toxic and electrical danger.
熟悉化学品和材料上使用的危害符号。识别易燃、腐蚀性、有毒和电气危险的标志。
4. Exploring Materials: Properties and Uses | 探索材料：特性与用途
Choosing the right material is a core engineering skill. A material’s properties determine how it behaves under different conditions. Engineers classify materials into groups: metals, polymers, ceramics, composites and woods.
选择合适的材料是一项核心的工程技能。材料的特性决定了它在不同条件下的表现。工程师将材料分为几类：金属、聚合物、陶瓷、复合材料和木材。
Key properties include strength, hardness, toughness, ductility, conductivity and density. For example, steel has high tensile strength and is used in bridges; aluminium is lightweight and resists corrosion, making it ideal for aircraft. Plastics are easy to mould but may soften with heat.
关键特性包括强度、硬度、韧性、延展性、导电性和密度。例如，钢具有高抗拉强度，用于桥梁；铝质轻且耐腐蚀，是制造飞机的理想材料。塑料易于成型，但受热可能会变软。
| Material 材料 |
Tensile Strength 抗拉强度 |
Density (g/cm³) 密度（克/立方厘米） |
Example Use 用途示例 |
|---|---|---|---|
| Mild Steel 低碳钢 |
High 高 |
7.8 | Building frames 建筑框架 |
| Aluminium 铝 |
Medium 中 |
2.7 | Aircraft bodies 飞机机身 |
| Acrylic (PMMA) 亚克力 |
Low 低 |
1.2 | Display screens 显示屏 |
| Pine wood 松木 |
Low (along grain) 低（顺纹） |
0.5 | Furniture 家具 |
During your summer bridging work, collect different objects and try to identify what material they are made from and why that material was chosen. Ask questions about strength, weight, cost and appearance.
在你的暑期衔接活动里，收集不同的物品，试着确定它们是由什么材料制成的，以及为什么选择这种材料。思考强度、重量、成本和外观等问题。
5. Forces, Loads and Structures | 力、载荷与结构
Structures must withstand forces without failing. The key forces you will meet are tension (pulling), compression (pushing), bending, shear and torsion. When an engineer designs a beam or a column, they calculate how these forces act on it.
结构必须能够承受力而不会失效。你会遇到的关键力包括：拉力（拉伸）、压力（压缩）、弯曲、剪力和扭转。当工程师设计梁或柱子时，他们会计算这些力如何作用于构件。
Newton’s second law relates force, mass and acceleration:
F = m × a
牛顿第二定律关联了力、质量和加速度：
F = m × a
where F is force in newtons (N), m is mass in kilograms (kg) and a is acceleration in metres per second squared (m/s²). On Earth, gravity gives an acceleration of about 9.8 m/s², which we often round to 10 m/s² for simple calculations.
其中 F 是力，单位牛顿 (N)；m 是质量，单位千克 (kg)；a 是加速度，单位米每二次方秒 (m/s²)。在地球上，重力加速度约为 9.8 m/s²，为简化计算我们常取 10 m/s²。
If a 2 kg book rests on a table, the downward force due to gravity is:
F = 2 kg × 10 m/s² = 20 N
如果一本 2 kg 的书放在桌上，由于重力产生的向下的力为：
F = 2 kg × 10 m/s² = 20 N
The table must provide an equal upward force (reaction) to keep the book still, illustrating Newton’s third law.
桌子必须提供一个相等的向上的力（反作用力）来保持书本静止，这体现了牛顿第三定律。
In structures, you will also encounter moments and equilibrium. For a beam supported at both ends with a load in the middle, the bending moment is greatest at the centre. Understanding these fundamentals helps you design safer bridges and buildings.
在结构中，你还会遇到力矩和平衡。对于两端支撑且中间有载荷的梁，弯矩在中心处最大。理解这些基本原理有助于你设计更安全的桥梁和建筑。
6. Simple Machines and Mechanical Advantage | 简单机械与机械效益
Simple machines make work easier by changing the magnitude or direction of a force. Levers, pulleys, wheels and axles, inclined planes, screws and wedges are the classic examples. They all trade distance for force, giving mechanical advantage.
简单机械通过改变力的大小或方向使工作变得更加容易。杠杆、滑轮、轮轴、斜面、螺旋和楔子是经典的例子。它们都以距离换取力，从而产生机械效益。
Mechanical advantage (MA) is the ratio of the output force (load) to the input force (effort):
MA = Load / Effort
机械效益（MA）是输出力（负载）与输入力（作用力）之比：
MA = 负载 / 作用力
For a first-class lever (like a crowbar), the pivot lies between the effort and the load. If the effort arm is longer than the load arm, MA is greater than 1, meaning you multiply the force.
对于第一类杠杆（如撬棍），支点位于作用力和负载之间。如果动力臂长于阻力臂，MA 大于 1，意味着你放大了力。
Example: A crowbar has an effort arm of 80 cm and a load arm of 20 cm.
MA = Effort arm length / Load arm length = 80 cm / 20 cm = 4
示例：一根撬棍的动力臂为 80 cm，阻力臂为 20 cm。
MA = 动力臂长 / 阻力臂长 = 80 cm / 20 cm = 4
So an effort of 100 N can lift a load of 400 N, although the effort must move four times further.
因此，100 N 的作用力可以举起 400 N 的负载，但作用力端需移动四倍的距离。
Gear systems and pulley blocks also use these principles. In a pulley system with three supporting ropes, the effort needed is roughly one third of the load (ignoring friction). Try experimenting with a simple block and tackle or a lever made from a ruler and a pencil during the holidays.
齿轮系统和滑轮组也运用了这些原理。在一个由三根承重绳索组成的滑轮系统中，所需的作用力约为负载的三分之一（忽略摩擦）。假期里可以尝试做一个简单的滑轮组，或者用直尺和铅笔制作一个杠杆。
7. Introduction to Electronics: Circuits and Components | 电子学基础：电路与元器件
Electronics is a vital branch of engineering. All electronic devices rely on circuits that control the flow of electric current. The basic quantities are voltage (V) measured in volts, current (I) in amperes (amps), and resistance (R) in ohms (Ω). Ohm’s Law links them:
电子学是工程学的一个重要分支。所有的电子设备都依赖于控制电流流动的电路。基本物理量有电压（V），单位伏特；电流（I），单位安培（安）；和电阻（R），单位欧姆（Ω）。欧姆定律将它们联系起来：
V = I × R
V = I × R
A simple circuit contains a power source (battery), a load (such as a lamp or motor) and connecting wires. A switch can open or close the circuit. Components connected in series share the same current; in parallel they share the same voltage.
一个简单的电路包含电源（电池）、负载（如灯泡或电机）和连接导线。开关可以接通或断开电路。串联的元器件流过相同的电流；并联的元器件两端电压相同。
Key components you should recognise:
你应该认识的关键元器件：
– Resistor: limits current, colour bands show its value.
– 电阻器：限制电流，色环显示其阻值。
– LED (Light Emitting Diode): allows current in one direction only and emits light; needs a series resistor to prevent damage.
– 发光二极管 (LED)：只允许单向电流通过并发光；需要串联一个电阻防止损坏。
– Transistor: acts as an electronic switch or amplifier.
– 晶体管：用作电子开关或放大器。
– Capacitor: stores electric charge temporarily.
– 电容器：暂时储存电荷。
Building simple circuits on a breadboard is a fantastic summer activity. Start with an LED and a resistor, then add a switch. Measure voltage and current with a multimeter if you have one.
在面包板上搭建简单电路是绝佳的暑期活动。从一个 LED 和一个电阻开始，然后加上一个开关。如果你有万用表，可以测量电压和电流。
8. Energy Sources and Sustainability in Engineering | 能源与工程中的可持续发展
Engineering decisions today are heavily influenced by the need to reduce carbon emissions and use resources wisely. Energy sources can be renewable (solar, wind, hydro, tidal, biomass) or non-renewable (coal, oil, natural gas, nuclear). Engineers design systems that convert energy from one form to another efficiently.
当今的工程决策深受减少碳排放和合理利用资源的需求影响。能源可分为可再生能源（太阳能、风能、水能、潮汐能、生物质能）和不可再生能源（煤、石油、天然气、核能）。工程师设计能够高效进行能量转换的系统。
Sustainability also involves choosing materials that can be recycled, reducing waste during manufacturing and designing products for longer life. The “6 Rs” of sustainable design are: reduce, reuse, recycle, repair, refuse and rethink.
可持续发展还包括选择可回收的材料、减少制造过程中的废弃物，以及设计使用寿命更长的产品。可持续设计的“6 个 R”是：减少（reduce）、再利用（reuse）、回收（recycle）、修复（repair）、拒绝（refuse）和重新思考（rethink）。
For example, wind turbines convert kinetic energy from the wind into electrical energy. Solar photovoltaic panels convert light energy directly into electricity. Engineers work on making these technologies more efficient and affordable.
例如，风力发电机将风的动能转化为电能。太阳能光伏板将光能直接转化为电。工程师致力于提高这些技术的效率和可负担性。
In your engineering studies, you will often be asked to evaluate the environmental impact of a product. Consider the energy used to extract raw materials, manufacture, transport, use and dispose of the product – this is called life cycle assessment.
在你的工程学习中，你会经常被要求评估产品的环境影响。要考虑原材料提取、制造、运输、使用和处置过程中消耗的能源——这被称为生命周期评估。
9. Communicating Ideas: Technical Drawings and CAD | 交流创意：技术制图与计算机辅助设计
Engineers must be able to communicate their designs clearly and accurately. Technical drawings use standard conventions so that anyone in the world can understand them. Two common types are orthographic projection (2D views) and isometric projection (3D sketch).
工程师必须能够清晰准确地传达他们的设计。技术制图使用标准惯例，以便世界上任何人都能看懂。两种常见的类型是正投影图（二维视图）和等轴测图（三维草图）。
Orthographic drawings show the front, side and plan views of an object. Dimensions are added with extension and dimension lines. Always place the dimensions clearly and use millimetres (mm) for small objects.
正投影图展示物体的主视图、侧视图和俯视图。尺寸用尺寸界线和尺寸线标注。始终清晰标注尺寸，对小物体使用毫米 (mm) 为单位。
Isometric drawing uses 30° angles to give a pictorial 3D view. It is not true perspective, but it helps visualise the shape. Practise drawing cubes, steps and brackets on isometric grid paper.
等轴测图使用 30° 角来提供图示性的三维视图。它不是真实的透视，但有助于可视化形状。尝试在等轴格纸上练习绘制立方体、台阶和支架。
Computer Aided Design (
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