📚 Year 7 CIE Engineering: Core Knowledge Points Review | Year 7 CIE 工程：核心知识点梳理
Engineering is about turning ideas into reality through scientific principles, creativity, and practical skills. In Year 7, you begin your journey by discovering how things work, from bridges to circuits, and learning the design process that all engineers use. This article collects the core knowledge points for the CIE Year 7 Engineering curriculum, helping you build a solid foundation for future study.
工程学是通过科学原理、创造力和实践技能把想法变成现实的学科。在七年级，你将从探索桥梁、电路等事物的原理开始，并学习所有工程师都使用的设计流程。这篇文章梳理了CIE七年级工程课程的核心知识点，帮助你为未来的学习打下坚实的基础。
1. What is Engineering? | 工程是什么？
Engineering is the application of mathematics and science to solve real-world problems. Engineers design, build, and test structures, machines, and systems while considering safety, cost, and sustainability.
工程学是应用数学和科学解决实际问题的学科。工程师在考虑安全性、成本和可持续性的同时，设计、建造并测试结构、机械和系统。
There are many branches of engineering, including civil, mechanical, electrical, and software engineering. In Year 7, you will explore basic ideas from all these areas, learning how they connect to everyday life.
工程学有许多分支，包括土木工程、机械工程、电气工程和软件工程。在七年级，你将探索所有这些领域的基本概念，了解它们与日常生活的联系。
Engineers follow a process: they identify a need, research, design solutions, build prototypes, test, and refine. This is called the engineering design cycle.
工程师遵循一个流程：他们识别需求、进行研究、设计解决方案、建造原型、测试并改进。这被称为工程设计循环。
2. The Engineering Design Process | 工程设计过程
The design process is a step-by-step method used to develop a product or system. It starts with defining the problem or need. Understanding the requirements and constraints (such as materials, time, and budget) is essential before generating ideas.
设计过程是一种用于开发产品或系统的逐步方法。它从定义问题或需求开始。在提出想法之前，理解要求和限制条件（如材料、时间和预算）是至关重要的。
After brainstorming possible solutions, engineers select the most promising one and develop a detailed design. They then build a prototype—a working model to test the concept. Testing and evaluating the prototype lead to improvements and redesign if necessary.
在头脑风暴出可能的解决方案后，工程师选择最有前景的一个并开展详细设计。然后他们建造原型——一个用于测试概念的工作模型。测试和评估原型会带来改进，并在必要时进行重新设计。
Communication is a vital part of the process. Engineers document their work through sketches, notes, and reports, and often work in teams. In Year 7, you will practice communicating design ideas using labelled drawings and simple presentations.
沟通是这一过程的关键部分。工程师通过草图、笔记和报告记录工作，并且经常团队合作。在七年级，你将练习使用带标注的图纸和简单的展示来传达设计想法。
3. Materials and Their Properties | 材料及其特性
Selecting the right material is critical in engineering. Materials can be classified into groups: metals, plastics, ceramics, composites, and natural materials like wood. Each material has properties that make it suitable for specific uses.
选择正确的材料在工程中至关重要。材料可以分为金属、塑料、陶瓷、复合材料和木材等天然材料。每种材料都有使其适用于特定用途的特性。
Key properties include strength (ability to withstand force without breaking), hardness (resistance to scratching or indentation), flexibility (ability to bend without snapping), conductivity (heat and electrical), and density (mass per unit volume). Engineers test these properties to predict how materials will behave in service.
关键特性包括强度（承受力而不破坏的能力）、硬度（抗刮擦或压痕的能力）、柔韧性（弯曲而不折断的能力）、导热/导电性以及密度（单位体积的质量）。工程师测试这些特性以预测材料在使用中的表现。
In Year 7, you might investigate common materials like steel, aluminium, acrylic, and pine, testing them with simple tools. You will also learn that sustainability matters—choosing recyclable or renewable materials reduces environmental impact.
在七年级，你可能会研究钢材、铝材、亚克力和松木等常见材料，用简单的工具进行测试。你还将了解到可持续性很重要——选择可回收或可再生材料可以减少对环境的影响。
4. Simple Machines and Mechanical Advantages | 简单机械与机械效益
Simple machines are devices that change the direction or magnitude of a force. The six classic simple machines are the lever, pulley, wheel and axle, inclined plane, wedge, and screw. They make work easier by reducing the effort needed to move a load.
简单机械是改变力的方向或大小的装置。六种经典的简单机械是杠杆、滑轮、轮轴、斜面、楔子和螺旋。它们通过减少移动负载所需的力来使工作更轻松。
rce. When the effort arm is longer than the load arm, a small effort can lift a large load.
机械效益 (MA) 描述一台机器将输入力放大了多少倍。对于杠杆，机械效益 = 负载力 ÷ 施力。当施力臂比负载臂长时，较小的力就能举起较大的负载。
MA = Fload ÷ Feffort
Pulleys can be combined to create a block and tackle system, increasing mechanical advantage. In your practical sessions, you might build models to measure how levers and pulleys can reduce effort, recording data in a table.
滑轮可以组合成滑车组系统，提高机械效益。在实践环节中，你可以搭建模型来测量杠杆和滑轮如何减少施力，并用表格记录数据。
5. Forces, Motion and Energy | 力、运动和能量
Forces are pushes or pulls that can cause objects to accelerate, decelerate, change direction, or deform. Common forces include gravity, friction, tension, and applied force. Forces are measured in newtons (N).
力是推或拉，可以使物体加速、减速、改变方向或变形。常见的力包括重力、摩擦力、张力和施加力。力以牛顿 (N) 为单位测量。
Newton' rt with a larger force, it accelerates more. Friction opposes motion and converts kinetic energy into heat, often requiring lubrication to reduce wear.
牛顿第二定律将力、质量和加速度联系起来：F = m × a。如果你用更大的力推一辆小车，它会加速得更快。摩擦力阻碍运动并将动能转化为热，通常需要润滑来减少磨损。
F = m × a
Energy is the capacity to do work. It exists in many forms: kinetic, potential (gravitational and elastic), thermal, electrical, and chemical. The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed. In engineering, understanding energy transfers helps in designing efficient machines.
能量是做功的能力。它以多种形式存在：动能、势能（重力势能和弹性势能）、热能、电能和化学能。能量守恒定律表明，能量不能被创造或毁灭，只能被转移或转化。在工程中，理解能量转换有助于设计高效的机器。
6. Structures and Stability | 结构与稳定性
Structures are designed to support loads. The main types are frame structures (e.g., a bicycle frame), shell structures (e.g., an eggshell or dome), and solid structures (e.g., a dam). Every structure must withstand tension, compression, torsion, shear, and bending forces.
结构被设计用来支撑负载。主要类型有框架结构（如自行车车架）、壳体结构（如蛋壳或穹顶）和实体结构（如大坝）。每种结构都必须承受拉力、压力、扭转力、剪切力和弯曲力。
Stability refers to a structure's ability to resist tipping over. A low centre of gravity and a wide base increase stability. Triangles are the strongest shape in construction because they cannot deform without changing side lengths, which is why they appear in trusses and bridges.
稳定性是指结构抵抗倾覆的能力。低重心和宽大的底座可以增加稳定性。三角形是建筑中最坚固的形状，因为它们在不改变边长的情况下无法变形，这就是为什么它们出现在桁架和桥梁中。
In Year 7, you may design and build a bridge from spaghetti or straws, testing how much weight it can hold before failure. You will learn to reinforce weak points and explain how forces are distributed through the members.
在七年级，你可能会用意面或吸管设计并搭建一座桥，测试它能承受多大重量才会损坏。你将学会加固薄弱点，并解释力如何通过构件分布。
7. Introduction to Electronics | 电子学入门
Electronics deals with circuits that control the flow of electric current. A simple circuit needs a power source (battery), a load (e.g., LED), and conductors (wires). Switches can open or close the circuit to control the light or motor.
电子学研究控制电流流动的电路。一个简单的电路需要电源（电池）、负载（如 LED）和导体（导线）。开关可以断开或闭合电路，以控制灯或马达。
Current is measured in amperes (A), voltage in volts (V), and resistance in ohms (Ω). Ohm' hip among these three. Resistors are components that limit current; LEDs must be protected by a suitable resistor to prevent burnout.
电流以安培 (A) 为单位，电压以伏特 (V) 为单位，电阻以欧姆 (Ω) 为单位。欧姆定律 V = I × R 解释了这三者之间的关系。电阻器是限制电流的元件；LED 必须由合适的电阻器保护以防烧毁。
V = I × R
You will learn to recognize circuit symbols and build circuits on a breadboard. Series circuits share the same current, while parallel circuits share the same voltage. Practical skills include measuring voltage with a multimeter and troubleshooting faulty connections.
你将学习识别电路符号并在面包板上搭建电路。串联电路中各处电流相同，而并联电路中各支路电压相同。实践技能包括用万用表测量电压以及排查连接故障。
8. Programmable Systems and Logic | 可编程系统与逻辑
Many modern engineering systems are controlled by microcontrollers or computers. Programming allows engineers to create automated responses to input conditions. In Year 7, you might use a platform like micro:bit or Arduino to write simple code.
许多现代工程系统由微控制器或计算机控制。编程使工程师能够创建对输入条件的自动响应。在七年级，你可能会使用 micro:bit 或 Arduino 等平台编写简单的代码。
Digital systems use binary logic: ON/OFF, 1/0. Logic gates (AND, OR, NOT) are the building blocks of decision-making circuits. An AND gate gives a high output only if all inputs are high; an OR gate gives a high output if any input is high; a NOT gate inverts the signal.
数字系统使用二进制逻辑：开/关、1/0。逻辑门（与门、或门、非门）是决策电路的构建模块。与门仅在所有输入都为高电平时才给出高电平输出；或门在任一输入为高电平时给出高电平输出；非门则将信号反转。
Below is a truth table for a basic AND gate:
| Input A | Input B | Output Q |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
Programming basics include sequences, loops, and conditionals. For example, you might program a traffic light system to cycle through red, yellow, and green. These skills link directly to designing automated solutions in engineering.
编程基础包括顺序、循环和条件语句。例如，你可以编程一个交通灯系统，使其依次循环红、黄、绿灯。这些技能直接关联到工程中自动化解决方案的设计。
9. Safety in the Workshop | 车间安全
Working safely is the first rule of engineering. Any workshop contains hazards—sharp tools, hot surfaces, moving parts, and electrical devices. Personal protective equipment (PPE) like safety glasses, aprons, and closed-toe shoes must be worn at all times.
安全工作是工程学的第一准则。任何车间都存在危险——锋利工具、高温表面、运动部件和电气设备。必须始终佩戴个人防护装备 (PPE)，如安全眼镜、围裙和包趾鞋。
You must know the safety rules: never run, tie back long hair, avoid loose clothing, report all accidents immediately, and know where the fire extinguisher and first-aid kit are located. When using tools like saws or soldering irons, follow the correct technique and keep your workspace tidy.
你必须了解安全守则：禁止奔跑、束起长发、避免穿着宽松衣物、立即报告所有事故，并熟知灭火器和急救箱的位置。在使用锯子或烙铁等工具时，要遵循正确技术并保持工作区域整洁。
Risk assessment is a simple but vital step: identify hazards, decide who might be harmed and how, evaluate the risks, and implement control measures. In Year 7, you will carry out basic risk assessments before practical activities to develop a safety mindset.
风险评估是一个简单却至关重要的步骤：识别危害、确定可能受影响的人和方式、评估风险并实施控制措施。在七年级，你将在实践活动前进行基本的风险评估，以培养安全意识。
10. Engineering Drawing and Communication | 工程绘图与交流
Engineers must communicate ideas clearly. Technical drawings, including orthographic and isometric sketches, convey the shape and dimensions of an object. Orthographic projection shows front, top, and side views separately, while isometric drawing gives a 3D-like view on a 2D surface.
工程师必须清晰地交流想法。技术图纸，包括正投影图和等角投影草图，传达物体的形状和尺寸。正投影图分别显示前视图、俯视图和侧视图，而等角图则在二维表面上呈现类似三维的视图。
Drawing to scale is important so that dimensions are accurate. You will use a ruler, set squares, and a compass to produce neat drawings. Dimension lines, leader lines, and notes help to avoid confusion.
按比例绘图很重要，以确保尺寸准确。你将使用直尺、三角板和圆规来绘制整洁的图纸。尺寸线、指引线和标注有助于避免混淆。
Beyond paper drawings, engineers use CAD (computer-aided design) software to create precise models. In Year 7, you might try simple CAD tools to design a 3D object. Clear verbal and written communication is also practised when presenting design proposals.
除了纸质图纸，工程师还使用 CAD（计算机辅助设计）软件创建精确模型。在七年级，你可以尝试简单的 CAD 工具来设计三维物体。在展示设计方案时，也要练习清晰的口头和书面交流。
Published by TutorHao | Engineering Revision Series | aleveler.com
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