📚 Year 11 Cambridge Physics: Summer Prep and Bridging Course | Year 11 剑桥物理：暑期预习与衔接课程
Welcome to your Year 11 Cambridge IGCSE Physics journey! The summer break is the perfect time to solidify your foundation and get a head start on the challenges ahead. This bridging course will help you revisit essential concepts from earlier years while introducing key Year 11 topics in a structured way, ensuring you step into the new academic year with confidence and clarity.
欢迎来到 Year 11 剑桥 IGCSE 物理的学习之旅！暑期是巩固基础、领先一步迎接挑战的黄金时间。本衔接课程将帮助你回顾之前学习的核心概念，同时系统地引入 Year 11 的关键主题，让你带着自信和清晰的目标迈入新学年。
1. Measurement and Units | 测量与单位
Accurate measurement lies at the heart of physics. You need to be able to use rulers, calipers, and micrometers for length, stopwatches for time, and balances for mass. Derived quantities like speed, force, and pressure all come from base units—metre, kilogram, second, ampere, kelvin, mole, and candela. Understanding prefixes such as kilo (10³), milli (10⁻³), and micro (10⁻⁶) is essential for converting values and writing them in standard form.
精确测量是物理学的核心。你需要掌握使用直尺、游标卡尺和千分尺测量长度，使用秒表测量时间，以及使用天平测量质量。导出量如速度、力和压强都来自于基本单位——米、千克、秒、安培、开尔文、摩尔和坎德拉。理解千（10³）、毫（10⁻³）、微（10⁻⁶）等词头对于数值转换和科学记数法的书写至关重要。
2. Motion in a Straight Line | 直线运动
Kinematics describes how objects move. Speed is the rate of change of distance: v = d / t. Acceleration is the rate of change of velocity: a = Δv / Δt. When motion is uniformly accelerated, we use the SUVAT equations. For free fall near the Earth's surface, acceleration is approximately 9.8 m/s². Graphical analysis of distance–time and speed–time graphs helps determine instantaneous values and areas under curves.
运动学描述物体如何运动。速度是距离的变化率：v = d / t。加速度是速度的变化率：a = Δv / Δt。当运动为匀加速时，我们使用 SUVAT 方程。在地表附近的自由落体运动中，加速度约为 9.8 m/s²。距离–时间图和速度–时间图的图形分析有助于确定瞬时值以及曲线下面积。
3. Forces and Newton's Laws | 力与牛顿定律
Newton's first law states that an object remains at rest or in uniform motion unless acted upon by a resultant force. The second law gives the quantitative link: F = m a, where force is measured in newtons. The third law reminds us that forces always come in pairs—if body A exerts a force on B, B exerts an equal and opposite force on A. Free-body diagrams are vital tools for solving problems involving tension, weight, normal reaction, and friction.
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。第二定律给出了定量关系：F = m a，力的单位是牛顿。第三定律提醒我们力总是成对出现的——如果物体 A 对 B 施加一个力，则 B 对 A 施加一个大小相等、方向相反的力。受力分析图是解决涉及拉力、重力、法向反力和摩擦力问题的重要工具。
4. Turning Effect and Equilibrium | 转动效应与平衡
The moment of a force about a pivot is defined as moment = force × perpendicular distance from pivot. The principle of moments says that for a body in rotational equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments. This concept is applied to levers, seesaws, and cranes. In Year 11 you will extend this to include the centre of gravity and stability, linking to objects toppling when the line of action of weight falls outside the base.
力对支点的力矩定义为力矩 = 力 × 从支点算起的垂直距离。力矩原理指出，对于处于转动平衡的物体，顺时针力矩之和等于逆时针力矩之和。这一概念应用于杠杆、跷跷板和起重机。在 Year 11 中，你将扩展到重心的概念和稳定性，涉及当重力作用线超出支撑底面时物体会倾倒的问题。
5. Energy Stores and Transfers | 能量储存与转移
Energy can be stored as kinetic (Eₖ = ½ m v²), gravitational potential (Eₚ = m g h), elastic, thermal, chemical, and more. The principle of conservation of energy states that energy cannot be created or destroyed, only transferred. Work is done when a force moves an object: W = F d. You will learn to represent energy changes using Sankey diagrams and to calculate efficiency as the ratio of useful output energy to total input energy.
能量可以储存为动能（Eₖ = ½ m v²）、重力势能（Eₚ = m g h）、弹性势能、热能、化学能等形式。能量守恒原理指出能量不能被创造或消灭，只能被转移。力移动物体时做了功：W = F d。你将学习用桑基图表示能量变化，并计算效率，即有用输出能量与总输入能量之比。
6. Thermal Physics and Gas Laws | 热物理与气体定律
Temperature in Kelvin is related to Celsius by T(K) = θ(°C) + 273. The kinetic particle model explains pressure in terms of random molecular collisions. Boyle's law (p₁V₁ = p₂V₂) holds at constant temperature; Charles's law (V ∝ T) at constant pressure; and Gay-Lussac's law (p ∝ T) at constant volume. The ideal gas equation pV = nRT combines these, and you will analyse how heating or compressing a gas changes its state and internal energy.
开尔文温标与摄氏温标的关系为T(K) = θ(°C) + 273。动力论粒子模型用分子的随机碰撞来解释压强。玻意耳定律（p₁V₁ = p₂V₂）在等温条件下成立；查理定律（V ∝ T）在等压条件下成立；盖-吕萨克定律（p ∝ T）在等容条件下成立。理想气体方程 pV = nRT 结合了这些关系，你将分析加热或压缩气体如何改变其状态和内能。
7. Waves: Properties and Behaviour | 波的性质与行为
Waves transfer energy without transferring matter. Transverse waves (e.g. light, water surface) have oscillations perpendicular to the direction of travel, while longitudinal waves (e.g. sound) have oscillations parallel to it. The wave speed equation v = f λ links frequency and wavelength. Reflection, refraction, and diffraction are common wave phenomena. You will apply these to water waves in a ripple tank and to light rays passing through prisms and lenses.
波传递能量而不传递物质。横波（如光、水面波）的振动方向与传播方向垂直，而纵波（如声波）的振动方向与传播方向平行。波速方程 v = f λ 联系了频率和波长。反射、折射和衍射是常见的波动现象。你将把这些概念应用到水波槽中的水波以及通过棱镜和透镜的光线上。
8. Electricity and Circuits | 电学与电路
Current is the rate of flow of charge: I = Q / t. Potential difference (voltage) is the work done per unit charge: V = W / Q. Resistance is defined as R = V / I. In series circuits, current is constant and voltages add up; in parallel circuits, voltage is constant and currents branch. Ohm's law applies to conductors at constant temperature. You will learn to use ammeters and voltmeters correctly and to calculate combined resistances.
电流是电荷流动的速率：I = Q / t。电势差（电压）是单位电荷所做的功：V = W / Q。电阻定义为 R = V / I。在串联电路中，电流处处相等，电压相加；在并联电路中，电压相等，电流分支。欧姆定律适用于恒温下的导体。你将学习正确使用电流表和电压表，并计算组合电阻。
9. Electromagnetic Effects | 电磁效应
A current-carrying conductor in a magnetic field experiences a force described by Fleming's left-hand rule. This is the principle behind electric motors. Conversely, when a conductor moves across magnetic field lines, an emf is induced—Faraday's law—which underpins generators and dynamos. Transformers change the magnitude of an alternating voltage and rely on electromagnetic induction. The turn ratio equation is Vₚ / Vₛ = Nₚ / Nₛ for an ideal transformer.
处于磁场中的载流导体会受到力的作用，方向由弗莱明左手定则确定，这是电动机背后的原理。相反，当导体切割磁感线运动时，会产生感应电动势——法拉第定律——这是发电机和直流发电机的基础。变压器可以改变交流电压的大小，依赖电磁感应工作。对于理想变压器，匝数比公式为 Vₚ / Vₛ = Nₚ / Nₛ。
10. Atomic and Nuclear Physics | 原子与核物理
Atoms have a tiny nucleus of protons and neutrons surrounded by orbiting electrons. Isotopes share the same proton number but differ in neutron number. Radioactive decay is random and produces alpha (α), beta (β), and gamma (γ) radiation, each with different penetrating powers and ionising abilities. The half-life of a radioactive substance is the time taken for half of its nuclei to decay. Nuclear equations balance mass and atomic numbers: e.g. ²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He.
原子由一个由质子和中子组成的极小原子核以及绕核运动的电子构成。同位素质子数相同但中子数不同。放射性衰变是随机的，产生 α、β 和 γ 辐射，各自的穿透能力和电离能力不同。放射性物质的半衰期是其半数原子核发生衰变所需的时间。核反应方程要平衡质量数和原子序数，例如：²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He。
11. Space Physics | 空间物理
The Earth orbits the Sun, and the Moon orbits the Earth due to gravitational attraction. Orbital speed relates to radius and period: v = 2πr / T. The solar system contains planets, dwarf planets, moons, asteroids, and comets. Beyond our solar system lie galaxies, including our Milky Way. The Doppler effect causes redshift in light from distant galaxies, providing evidence for the Big Bang theory and the expanding Universe.
地球绕太阳运行，月球绕地球运行，都是由于引力作用的结果。轨道速度与轨道半径和周期有关：v = 2πr / T。太阳系包含行星、矮行星、卫星、小行星和彗星。在太阳系之外是星系，包括我们的银河系。多普勒效应导致来自遥远星系的光发生红移，为大爆炸理论和宇宙膨胀提供了证据。
12. Experimental Skills and Exam Approach | 实验技能与应试方法
IGCSE Physics places strong emphasis on practical skills. You should be able to plan investigations with fair tests, identify independent, dependent, and control variables, and record data in well-designed tables. Graphing skills include choosing appropriate scales, plotting points accurately, drawing best-fit lines, and calculating gradients. The analysis of experimental errors and the ability to suggest improvements are frequently assessed in the alternative-to-practical paper.
IGCSE 物理非常注重实验技能。你应当能够设计具有公平测试的研究方案，识别自变量、因变量和控制变量，并在设计合理的表格中记录数据。作图技能包括选择合适的尺度、准确描点、画出最佳拟合线以及计算斜率。对实验误差的分析和提出改进建议的能力在实验替代考试中经常被考查。
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