📚 Year 11 Cambridge Physics: Complete Syllabus Breakdown | Year 11 剑桥物理：课程大纲全面解析
Understanding the Year 11 Cambridge Physics syllabus is the first step toward exam success. This guide breaks down every core topic, from mechanics to nuclear physics, aligning with the latest Cambridge IGCSE Physics 0625 specification. Whether you are aiming for a high grade in the Core or Extended tier, a clear map of what to study will sharpen your revision and boost your confidence.
理解 Year 11 剑桥物理课程大纲是赢得考试成功的第一步。本文按照最新的剑桥 IGCSE 物理 0625 大纲，逐模块解析所有核心主题，从力学到核物理。无论你目标是核心还是扩展层的高分，一份清晰的复习路线图都能让你的备考更聚焦、更有信心。
1. Syllabus Overview | 课程大纲总览
Cambridge IGCSE Physics (0625) assesses three Assessment Objectives: AO1 knowledge with understanding, AO2 handling information and problem solving, and AO3 experimental skills. All candidates enter for three papers: Paper 1 or 2 (Multiple Choice), Paper 3 or 4 (Theory), and Paper 5 or 6 (Practical Test or Alternative to Practical). Core candidates take Papers 1, 3, and 5/6, with grades C–G available, while Extended candidates take Papers 2, 4, and 5/6, with grades A*–G available.
剑桥 IGCSE 物理 (0625) 考查三项评价目标：AO1 知识与理解，AO2 信息处理与问题解决，AO3 实验技能。所有考生都参加三份试卷：卷一或卷二（选择题）、卷三或卷四（理论题）以及卷五或卷六（实验操作或实验替代）。核心层考生参加卷一、卷三和卷五/六，可获 C–G 等级；扩展层考生参加卷二、卷四和卷五/六，可获 A*–G 等级。
The syllabus content is organised into six main topic areas: General Physics, Thermal Physics, Waves, Electricity and Magnetism, Nuclear Physics, and Space Physics. The Space Physics section is a recent addition, reflecting modern cosmology and astrophysics at an introductory level. Throughout the course, practical skills are embedded, with at least 20% of marks derived from experimental contexts.
课程内容分为六大主题：普通物理、热学、波动、电磁学、核物理和空间物理。空间物理是近期新增的模块，反映了初级的现代宇宙学与天体物理知识。在整个课程中，实验技能贯穿始终，至少有 20% 的分数来自实验相关的背景。
2. Motion | 运动
peed in a given direction. The average speed v = s/t. Acceleration a = (v - u)/t, where u is initial velocity, v is final velocity, and t is time. Motion can be represented on distance–time and speed–time graphs; the gradient of a distance–time graph gives speed, and the gradient of a speed–time graph gives acceleration. The area under a speed–time graph represents distance.
运动学从速率、速度和加速度的定义开始。速率是路程随时间的变化率，为标量；而速度是带方向的速率。平均速率 v = s/t。加速度 a = (v - u)/t，其中 u 为初速度，v 为末速度，t 为时间。运动可以用距离–时间图和速率–时间图表示；距离–时间图的斜率给出速率，速率–时间图的斜率给出加速度。速率–时间图下的面积表示路程。
The equations of uniformly accelerated motion—often called SUVAT equations— cceleration is constant. Free-fall under gravity is a classic application, where acceleration a = g = 9.8 m/s² near the Earth's surface, neglecting air resistance.
匀加速运动方程（常称 SUVAT 方程）至关重要。对于匀加速直线运动：v = u + at，s = ut + ½ at²，v² = u² + 2as，s = ½ (u + v) t。这些方程仅当加速度恒定时成立。自由落体运动是一个经典应用，此时加速度 a = g = 9.8 m/s²（地表附近，忽略空气阻力）。
3. Forces and Newton’s Laws | 力与牛顿定律
Forces are pushes or pulls that can change an object' tion, tension, and air resistance. Free-body diagrams help identify all forces acting on an object and their resultant. Newton’s first law states that an object remains at rest or in uniform motion unless acted on by a resultant force.
力是能改变物体形状、速率或方向的推或拉。力是矢量，单位是牛顿 (N)。常见类型包括重力 (W = mg)、支持力、摩擦力、拉力和空气阻力。受力分析图有助于识别作用在物体上的所有力及其合力。牛顿第一定律指出，除非受到合力作用，物体将保持静止或匀速直线运动状态。
. A larger resultant force produces greater acceleration for a given mass, while greater mass reduces acceleration for the same force. Newton’s third law states that forces occur in pairs: if body A exerts a force on body B, then body B exerts an equal and opposite force on body A. These action–reaction pairs act on different objects.
牛顿第二定律联系了合力、质量和加速度：F = ma。对一定质量，更大的合力产生更大的加速度；而在相同的力下，质量越大，加速度越小。牛顿第三定律指出力成对出现：若物体 A 对物体 B 施加力，则 B 同时对 A 施加大小相等、方向相反的力。这一对作用力与反作用力作用在不同物体上。
llision equals total momentum after. Impulse is equal to the change in momentum, also equal to force × time (Ft = Δp). This explains how crumple zones and airbags reduce injury by increasing collision time and thus reducing force.
动量 p 定义为质量 × 速度 (p = mv)。动量守恒定律指出，在封闭系统中，碰撞前的总动量等于碰撞后的总动量。冲量等于动量的变化量，也等于力 × 时间 (Ft = Δp)。这解释了为何溃缩区和安全气囊通过延长碰撞时间来减小作用力，从而降低受伤风险。
4. Energy, Work, and Power | 能量、功与功率
), and the principle of conservation of energy: energy can be transferred or transformed but never created or destroyed. Work done W = Fd when a force F moves an object through distance d in the direction of the force.
能量是做功的能力，单位是焦耳 (J)。大纲涵盖动能 (KE = ½ mv²)、重力势能 (GPE = mgh) 以及能量守恒定律：能量可以转移或转化，但不会凭空产生或消失。当力 F 沿力的方向将物体移动距离 d 时，所做的功 W = Fd。
is measured in watts (W, equivalent to J/s). Efficiency is the ratio of useful output energy (or power) to total input energy (or power), often expressed as a percentage. Sankey diagrams visualise energy transfers, with the width of arrows proportional to energy amounts.
功率 P 是做功或转移能量的速率：P = W/t 或 P = E/t。单位为瓦特 (W，等价于 J/s)。效率是有用输出能量（或功率）与总输入能量（或功率）之比，常用百分数表示。桑基图可直观显示能量转移，箭头的宽度与能量大小成正比。
Renewable energy resources—solar, wind, tidal, hydroelectric, geothermal—offer sustainable but often intermittent supplies. Non-renewable resources like fossil fuels and nuclear fuels provide reliable but environmentally challenging energy. Candidates must compare their advantages and disadvantages in terms of cost, environmental impact, and energy density.
可再生能源资源——太阳能、风能、潮汐能、水能、地热能——提供可持续但往往间歇性的供应。不可再生资源如化石燃料和核燃料提供可靠但存在环境挑战的能源。考生需从成本、环境影响和能量密度等方面比较它们的优缺点。
5. Thermal Physics | 热学
The kinetic particle model describes matter in solids, liquids, and gases in terms of particle arrangement, motion, and spacing. Brownian motion provides evidence for the random motion of particles. Temperature is a measure of the average kinetic energy of particles; absolute temperature is measured in kelvin (K), where 0 K is absolute zero (−273°C).
分子动理模型根据粒子排列、运动和间距描述固态、液态和气态。布朗运动为粒子的无规则运动提供了证据。温度是粒子平均动能的量度；绝对温度以开尔文 (K) 计，0 K 即为绝对零度 (−273 °C)。
vaporisation. Evaporation takes place at the surface at any temperature, cooling the remaining liquid because the most energetic particles escape. The gas laws relate pressure p, volume V, and temperature T: for a fixed mass of ideal gas, pV = constant (at constant T), V/T = constant (at constant p), and p/T = constant (at constant V).
沸腾和蒸发是不同的过程。沸腾在某一固定温度发生于液体整体，需要持续供应汽化潜热。蒸发可在任何温度发生于液体表面，由于能量最高的粒子逸出，使剩余液体冷却。气体定律关联压强 p、体积 V 和温度 T：对于一定质量理想气体，恒温下 pV = 常数，恒压下 V/T = 常数，恒容下 p/T = 常数。
easures the energy needed to change the state of 1 kg without temperature change. Experiments to determine c and L usually involve electrical heaters, insulated containers, and temperature measurements.
比热容 c = E/(mΔθ) 表示使 1 kg 物质温度升高 1 °C 所需的能量。比潜热 L = E/m 衡量使 1 kg 物质不改变温度而改变物态所需的能量。测定 c 和 L 的实验通常涉及电加热器、绝热容器和温度测量。
6. Waves | 波动
dicular to the direction of energy transfer, while longitudinal waves (e.g., sound) have vibrations parallel. Key quantities include wavelength λ, frequency f, amplitude, and wave speed v. The wave equation v = fλ links them. Reflection and refraction occur at boundaries; refraction involves a change in speed and direction.
波传递能量而不传递物质。横波（如光、水波、电磁波）的振动方向垂直于能量传递方向；纵波（如声波）的振动方向平行于能量传递方向。关键量包括波长 λ、频率 f、振幅和波速 v。波动方程 v = fλ 将它们联系在一起。在边界上会发生反射和折射；折射涉及速率和方向的改变。
a common speed in a vacuum (c = 3.0 × 10⁸ m/s) and differ in wavelength and frequency. Applications range from communication (radio, microwaves) to medicine (X-rays, gamma rays). Students must be able to order the spectrum, describe dangers (e.g., UV causing skin cancer, X-rays ionising cells), and recall typical uses.
电磁波谱是连续的：无线电波、微波、红外线、可见光、紫外线、X 射线和伽马射线。它们在真空中速率相同 (c = 3.0 × 10⁸ m/s)，波长和频率不同。应用涵盖通信（无线电波、微波）到医疗（X 射线、伽马射线）。学生须能排列表谱，描述危害（如紫外线致皮肤癌、X 射线的电离效应）并记住典型用途。
Sound waves are longitudinal, requiring a medium. Echoes and sonar exploit reflection. The speed of sound varies with the medium (fastest in solids, slowest in gases). Pitch relates to frequency, loudness to amplitude. An oscilloscope trace displays waveforms, enabling measurement of time period and amplitude.
声波是纵波，需要介质传播。回声和声呐利用反射原理。声速因介质而异（固体中最快，气体中最慢）。音调取决于频率，响度取决于振幅。示波器波形图可显示波形，用于测量周期和振幅。
7. Electricity and Magnetism | 电学与磁学
nergy transferred per unit charge (V = W/Q). Resistance R = V/I, measured in ohms (Ω). Ohm' and parallel circuits have different rules for current and voltage: in series, current is the same, voltage splits; in parallel, voltage is the same across branches, current splits.
电流 I 是电荷流动的速率 (Q = It)。电压（电势差）V 是单位电荷转移的能量 (V = W/Q)。电阻 R = V/I，单位欧姆 (Ω)。欧姆定律指出，在温度不变时，流过导体的电流与其两端电势差成正比。串联电路和并联电路遵循不同的电流、电压规律：串联时电流处处相等而电压分配；并联时各支路电压相同而电流分配。
Common circuit components include resistors, variable resistors, lamps, diodes, and thermistors. A filament lamp shows non-ohmic behaviour because its resistance increases with temperature. A diode allows current in one direction only. The resistance of an LDR (light-dependent resistor) falls as light intensity increases; a thermistor’s resistance falls as temperature rises. These can be used as sensors.
常见电路元件包括电阻器、可变电阻器、灯泡、二极管和热敏电阻。白炽灯因温度升高时电阻增大而呈现非欧姆特性。二极管只允许单向电流通过。光敏电阻 (LDR) 的电阻随光照强度增大而减小；热敏电阻的电阻随温度升高而减小。它们可用作传感器。
eld around a current-carrying wire is circular, determined by the right-hand grip rule. For a solenoid, the field pattern resembles that of a bar magnet. Electromagnetic induction occurs when a conductor cuts magnetic field lines, generating an e.m.f. Transformers change voltage using two coils on a common iron core; Vₚ/Vₛ = Nₚ/Nₛ, assuming 100% efficiency.
磁性源于运动电荷。永磁体产生磁场；通电螺线管用作电磁铁。载流导线周围的磁场为环形，方向由右手螺旋定则判断。螺线管的磁场分布与条形磁铁相似。当导体切割磁感线时发生电磁感应，产生感应电动势。变压器利用共铁芯上的两个线圈改变电压；在理想 100% 效率下，Vₚ/Vₛ = Nₚ/Nₛ。
8. Nuclear Physics | 核物理
Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons. The atomic (proton) number Z identifies the element, while the mass (nucleon) number A is the total of protons plus neutrons. Isotopes are atoms of the same element with different neutron numbers. Alpha (α) particles are helium nuclei (²He), beta (β) particles are fast electrons, and gamma (γ) rays are electromagnetic waves.
原子由包含质子和中子的原子核以及绕核电子构成。原子序数（质子数）Z 确定元素身份，质量数（核子数）A 等于质子与中子之和。同位素是同种元素但中子数不同的原子。α 粒子是氦核 (²He)，β 粒子是高速电子，γ 射线是电磁波。
Radioactive decay is random and spontaneous. The three types of radiation differ in ionising power (α > β > γ) and penetrating ability (γ > β > α). Background radiation comes from rocks, cosmic rays, and artificial sources. The half-life is the time taken for half the nuclei in a sample to decay. Applications of radiation include tracers, thickness gauging, and sterilising medical equipment. Safety precautions involve shielding, distance, and minimising exposure time.
放射性衰变是随机且自发的。三种辐射的电离能力 (α > β > γ) 和穿透能力 (γ > β > α) 各不相同。背景辐射来自岩石、宇宙射线和人工源。半衰期是样品中半数原子核发生衰变所需的时间。辐射的应用包括示踪、测厚和医疗器械消毒。安全防护措施包括屏蔽、拉远距离和缩短暴露时间。
Nuclear fission splits a heavy nucleus (e.g., uranium-235) into two smaller nuclei, releasing energy and neutrons. A chain reaction is sustained in a reactor by controlling the number of neutrons. Nuclear fusion joins light nuclei (hydrogen isotopes) to form helium, releasing even greater energy. Fusion occurs in stars but remains a challenge for controlled energy generation on Earth due to the extreme temperatures required.
核裂变使重核（如铀-235）分裂为两个轻核，释放能量和中子。通过控制中子数量，可在反应堆中维持链式反应。核聚变将轻核（氢同位素）融合形成氦，释放更巨大的能量。聚变在恒星内进行，但由于需要极端温度，在地球上实现可控能源仍是挑战。
9. Space Physics | 空间物理
The Earth rotates on its axis once every 24 hours, causing day and night, and orbits the Sun in approximately 365.25 days, causing seasons due to the tilt of its axis. The Moon orbits Earth, and its gravitational pull creates tides. The Solar System consists of the Sun, eight planets, dwarf planets, asteroids, and comets, all held in orbit by the Sun’s gravity.
地球每 24 小时自转一周，形成昼夜；以约 365.25 天绕太阳公转，地轴的倾斜导致四季变化。月球绕地球运行，其引力产生潮汐。太阳系由太阳、八大行星、矮行星、小行星和彗星组成，均由太阳引力维系在轨道上。
Stars form from clouds of gas and dust (nebulae) that collapse under gravity. As the core heats up, hydrogen fuses into helium, entering the main sequence. A star like the Sun later becomes a red giant, then a planetary nebula and white dwarf. More massive stars become red supergiants and end as supernovae, leaving neutron stars or black holes. The brightness of a star depends on its luminosity and distance; apparent magnitude is how bright it appears from Earth.
恒星由引力坍塌的气体尘埃云（星云）演化而来。核心升温后，氢聚变为氦，进入主序星阶段。类似太阳的恒星后来变成红巨星，再变成行星状星云和白矮星。更大质量恒星成为红超巨星，最终以超新星收场，留下中子星或黑洞。恒星的亮度取决于其光度和距离；视星等是从地球上看到的亮度。
The Universe is expanding, as evidenced by the redshift of light from distant galaxies. This supports the Big Bang theory, which states that the Universe originated from an extremely hot, dense point. Observations of cosmic microwave background radiation provide further evidence. Dark matter and dark energy remain active areas of research, but the syllabus covers basic cosmological expansion and evidence for the Big Bang.
宇宙正在膨胀，遥远星系的光存在红移，可作为证据。这支持了大爆炸理论，即宇宙源于一个极高温、高密的奇点。宇宙微波背景辐射的观测提供了进一步证据。暗物质和暗能量仍是活跃的研究领域，但大纲涵盖基本的宇宙膨胀和大爆炸证据。
10. Practical Skills and Exam Strategies | 实验技能与考试策略
Practical work is assessed through Paper 5 (Practical Test) or Paper 6 (Alternative to Practical). Skills include measuring with instruments (ruler, micrometer, stopwatch, ammeter, voltmeter), recording data in tables, plotting graphs, and analysing trends. Common investigations: determining the density of regular and irregular solids, measuring specific heat capacity, measuring the speed of sound, finding the focal length of a lens, and investigating resistance.
实验能力通过卷五（实验操作）或卷六（实验替代）进行考核。技能包括使用仪器测量（尺、千分尺、秒表、电流表、电压表）、在表中记录数据、绘制图表和分析趋势。常见实验：测定规则与不规则固体的密度、测量比热容、测量声速、求透镜焦距和探究电阻。
When tackling theory papers, focus on command words: 'state' means give a concise fact, 'describe' requires a step-by-step account, and 'explain' means link cause and effect using scientific principles. For calculations, always show working, substitute values into the correct equation, and give the answer with a unit. Draw diagrams with a sharp pencil and label clearly. Managing time is crucial: allocate roughly 1 minute per mark, and leave harder questions for review.
解答理论试卷时，务必注意指令词：“state” 要求给出简洁的事实，“describe” 需要逐步描述，“explain” 则需运用科学原理将因果联系起来。计算题一定要写出过程，代入正确的公式，给出带单位的答案。绘制图表应使用削尖的铅笔，清晰标注。时间管理至关重要：大致按每分钟 1 分分值分配，难题留待回头检查。
Effective revision uses active recall, not just re-reading. Practise past papers under timed conditions, identify weak topics, and review mark schemes to understand examiner expectations. Make concise notes for each topic, with key formulas, definitions, and typical errors. Flashcards can help memorise equations and unit conversions. Consistent, spaced revision sessions yield better retention than cramming.
高效复习使用主动回忆法，而非单纯重读。设时完成历年真题，找出薄弱环节，研读评分方案以理解考官要求。为每个主题整理精简笔记，涵盖关键公式、定义和常见错误。闪卡有助于记忆方程式和单位换算。持续、间隔进行的复习比死记硬背更能长久保持记忆。
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