Year 10 CAIE Physics: Core Concepts Summary | Year 10 CAIE 物理：核心知识点梳理

📚 Year 10 CAIE Physics: Core Concepts Summary | Year 10 CAIE 物理：核心知识点梳理

This article presents a systematic review of the core topics in the Year 10 CAIE Physics syllabus. Each section covers essential definitions, key formulas, and conceptual understanding, helping students build a strong foundation for their IGCSE examination.

本文系统梳理 Year 10 CAIE 物理课程的核心知识点。每个小节都涵盖基本定义、重要公式和概念理解，帮助学生为 IGCSE 考试打下坚实的基础。

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1. Kinematics and Motion Graphs | 运动学与运动图像

Kinematics describes motion without considering its causes. The fundamental quantities are distance (scalar) and displacement (vector), as well as speed (scalar) and velocity (vector). Average speed is total distance divided by total time, while average velocity is total displacement over time.

运动学描述物体的运动而不涉及力的作用。基本物理量包括距离（标量）与位移（矢量），以及速率（标量）与速度（矢量）。平均速率是总距离除以总时间，而平均速度是总位移除以时间。

v = s / t

公式 v = s / t 给出了匀速运动中的速率或速度大小。

Acceleration is the rate of change of velocity. If an object changes its velocity from u to v in time t, the acceleration a is:

加速度是速度的变化率。若物体在时间 t 内速度从初速 u 变为末速 v，则加速度 a 为：

a = (v − u) / t

加速度 a = (v − u) / t。减速时加速度为负值。

Motion graphs are powerful tools. A distance-time graph has gradient equal to speed. A horizontal line means the object is stationary. A speed-time graph gives acceleration by its gradient; the area under the graph represents the distance travelled.

运动图像是重要的分析工具。距离−时间图的斜率表示速率，水平线代表物体静止。速度−时间图的斜率给出加速度，图线下的面积表示行进的距离。

In free fall near the Earth’s surface, objects experience a constant acceleration g, approximately 10 m/s². When air resistance balances weight, a falling object reaches terminal velocity.

在地球表面附近的自由落体中，物体受恒定的重力加速度 g，约为 10 m/s²。当空气阻力与重力平衡时，下落的物体达到终极速度。

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2. Forces and Newton’s Laws | 力与牛顿定律

A force is a push or pull that can change an object’s shape or motion. Newton’s first law states that an object remains at rest or in uniform motion unless acted upon by a resultant force.

力是能改变物体形状或运动状态的推拉作用。牛顿第一定律指出，若无合外力作用，物体将保持静止或匀速直线运动。

Newton’s second law links resultant force F, mass m, and acceleration a:

牛顿第二定律建立了合外力 F、质量 m 与加速度 a 的关系：

F = m a

F = m a 表明加速度与合外力成正比，与质量成反比。

Newton’s third law says every action has an equal and opposite reaction. Weight is the gravitational force on a mass: W = m g. Mass is measured in kg, weight in newtons.

牛顿第三定律指出每个作用力都有一个大小相等、方向相反的反作用力。重量是质量所受的重力：W = m g。质量的单位是千克，重量的单位是牛顿。

Friction and air resistance oppose motion. Hooke’s law describes the extension of a spring: F = k x, where k is the spring constant and x is the extension, valid only up to the limit of proportionality.

摩擦力和空气阻力阻碍运动。胡克定律描述弹簧的伸长：F = k x，其中 k 为劲度系数，x 为伸长量，但只在比例限度内成立。

The moment of a force about a pivot is force × perpendicular distance. The principle of moments states that for equilibrium, total clockwise moment equals total anticlockwise moment.

力对支点的力矩等于力乘以垂直距离。力矩原理表明，平衡时顺时针力矩之和等于逆时针力矩之和。

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3. Energy, Work and Power | 能量、功和功率

Energy is the ability to do work. Work done by a constant force is W = F d, where d is the distance moved in the direction of the force.

能量是做功的本领。恒力所做的功为 W = F d，其中 d 为沿力方向移动的距离。

Kinetic energy (KE) of a moving object is ½ m v². Gravitational potential energy (GPE) gained by lifting an object is m g h, where h is the height change.

运动物体的动能 KE = ½ m v²。物体升高所增加的重力势能 GPE = m g h，其中 h 为高度变化。

KE = ½ m v²
GPE = m g h

动能和重力势能的表达式如上，能量单位均为焦耳 (J)。

The principle of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed. Efficiency is useful output energy (or power) divided by total input energy, often expressed as a percentage.

能量守恒定律指出，能量既不能被创造也不能被消灭，只能被转移或转化。效率等于有用输出能量（或功率）除以总输入能量，常用百分比表示。

Power is the rate of doing work or transferring energy: P = W / t, measured in watts (W).

功率是做功或转移能量的速率：P = W / t，单位为瓦特 (W)。

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4. Thermal Physics and States of Matter | 热物理与物质状态

Matter exists as solid, liquid or gas. The kinetic particle model explains properties in terms of particle arrangement and motion. Brownian motion provides evidence for random particle movement.

物质以固态、液态或气态存在。分子动理论通过粒子的排列和运动解释物质的性质。布朗运动为粒子的无规则运动提供了证据。

Temperature is a measure of the average kinetic energy of particles. Absolute zero is 0 K (−273 °C), where particle motion would have minimum energy.

温度是粒子平均动能的量度。绝对零度为 0 K (−273 °C)，此时粒子的运动能达到最低点。

When a substance is heated, its temperature rise depends on its specific heat capacity c. The heat energy Q required is:

当物质受热时，其升高的温度取决于比热容 c。所需的热量 Q 为：

Q = m c Δθ

Q = m c Δθ，其中 m 为质量，Δθ 为温度变化。

During a change of state, the temperature stays constant while latent heat is absorbed or released. For melting or boiling, Q = m L, where L is the specific latent heat.

在物态变化过程中，温度保持不变，同时吸收或释放潜热。熔化或沸腾时，Q = m L，L 为比潜热。

Thermal energy is transferred by conduction (solids), convection (fluids) and radiation (electromagnetic waves). Good conductors have high thermal conductivity; insulators reduce energy transfer.

热能通过传导（固体）、对流（流体）和辐射（电磁波）传递。良导体具有高的导热率，而绝热体可减少能量转移。

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5. Waves: Properties and Behaviour | 波的性质与行为

Waves transfer energy without transferring matter. Transverse waves (e.g. light, water ripples) have oscillations perpendicular to the wave direction. Longitudinal waves (e.g. sound) have oscillations parallel to the direction.

波传递能量而不传递物质。横波（如光、水波）的振动方向与波传播方向垂直；纵波（如声波）的振动方向与传播方向平行。

Key wave terms: amplitude A (maximum displacement), wavelength λ (distance between consecutive crests), frequency f (number of waves per second), and period T = 1/f.

关键波参数：振幅 A（最大位移）、波长 λ（相邻波峰间的距离）、频率 f（每秒波数）和周期 T = 1/f。

The wave equation links speed v, frequency f and wavelength:

波速方程联系波速 v、频率 f 和波长 λ：

v = f λ

v = f λ，波速通常由介质决定。

Reflection occurs when waves bounce off a surface, obeying the law of reflection (angle of incidence equals angle of reflection). Refraction is the change in wave speed (and direction) when entering a different medium. Diffraction is the spreading of waves around obstacles or through gaps.

波遇到表面会发生反射，遵守反射定律（入射角等于反射角）。折射是波进入不同介质时速度（和方向）的改变。衍射是波绕过障碍物或穿过狭缝时扩散的现象。

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6. Light and Electromagnetic Spectrum | 光与电磁波谱

Light reflects off smooth surfaces following the law of reflection. Refraction occurs when light passes from one transparent medium to another, changing speed and direction. Snell’s law is n = sin i / sin r, where n is the refractive index.

光在光滑表面反射时遵守反射定律。光从一种透明介质进入另一种时发生折射，速度和方向改变。斯涅尔定律：n = sin i / sin r，n 为折射率。

When light travels from a denser to a less dense medium, total internal reflection occurs if the angle of incidence exceeds the critical angle c, where sin c = 1/n. This principle is used in optical fibres.

当光从光密介质射向光疏介质且入射角大于临界角 c 时，发生全内反射，sin c = 1/n。该原理用于光纤。

Converging (convex) lenses bring parallel rays to a focus. They can form real, inverted images or virtual, magnified images depending on object distance. Diverging (concave) lenses always produce virtual, diminished images.

会聚（凸）透镜将平行光线会聚到焦点，能形成倒立实像或正立放大虚像，取决于物距。发散（凹）透镜总是产生正立缩小的虚像。

The electromagnetic spectrum, in order of increasing frequency, includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. All EM waves travel at 3×10⁸ m/s in vacuum and transfer energy.

电磁波谱按频率递增的顺序为：无线电波、微波、红外线、可见光、紫外线、X 射线和伽马射线。所有电磁波在真空中以 3×10⁸ m/s 的速度传播并传递能量。

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7. Electricity and Circuits | 电学与电路

Electric current I is the rate of flow of charge: I = Q / t, measured in amperes (A). Potential difference (voltage V) is the energy transferred per unit charge. Resistance R measures how much a component opposes current.

电流 I 是电荷的流动速率：I = Q / t，单位为安培 (A)。电势差（电压 V）是每单位电荷转移的能量。电阻 R 衡量元件对电流的阻碍程度。

V = I R

欧姆定律 V = I R 适用于恒定温度下的金属导体。

In series circuits, current is the same everywhere and total resistance is R_total = R₁ + R₂. The supply voltage is shared. In parallel circuits, the voltage across each branch is the same, and the total current equals the sum of branch currents. Combined resistance is given by 1/R_total = 1/R₁ + 1/R₂.

在串联电路中，各处电流相等，总电阻 R_total = R₁ + R₂，电源电压按比例分配。在并联电路中，各支路电压相同，总电流等于各支路电流之和，组合电阻遵循 1/R_total = 1/R₁ + 1/R₂。

Electrical power P = I V = I² R, and energy transferred E = I V t. Practical safety includes fuses and circuit breakers that melt or trip when excessive current flows.

电功率 P = I V = I² R，传输的电能 E = I V t。实际安全措施包括熔断器和断路器，在电流过大时熔断或跳闸。

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8. Magnetism and Electromagnetism | 磁与电磁

Magnets have north and south poles; like poles repel, unlike poles attract. Magnetic field lines show the direction of the force on a north pole. The Earth has a magnetic field that guides compasses.

磁铁有北极和南极；同极相斥，异极相吸。磁感线表示北极力所受的方向。地球自身拥有磁场，能指引指南针。

A current-carrying wire produces a magnetic field. The right-hand grip rule gives the field direction. An electromagnet consists of a solenoid often with an iron core, making the field stronger.

载流导线产生磁场

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