📚 Year 10 CAIE Physics: Key Concepts Summary | CAIE 十年级物理核心知识点梳理
This article provides a structured revision of the essential topics in the Year 10 CAIE IGCSE Physics syllabus. Mastering these foundational ideas in mechanics, energy, thermal physics, waves, electricity, magnetism and atomic physics will strengthen your understanding and prepare you for assessments. Each section presents key definitions, formulas and explanations to support your learning.
本文系统梳理了 CAIE 十年级（IGCSE）物理课程的核心知识点。掌握力学、能量、热物理、波、电学、磁学和原子物理的基本概念是学好物理的关键，也能帮助你顺利应对各类测试。每个小节都提供了重要的定义、公式和说明，辅助你巩固基础。
1. Kinematics | 运动学
Kinematics describes how objects move, using quantities such as displacement, speed, velocity and acceleration. Average speed v = s / t, where s is distance and t is time. Acceleration is the rate of change of velocity: a = (v − u) / t, with u as initial velocity and v as final velocity. The equations of uniformly accelerated motion include v = u + a t and v² = u² + 2 a s.
运动学研究物体如何运动，涉及位移、速率、速度和加速度等物理量。平均速率 v = s / t（s 为路程，t 为时间）。加速度是速度的变化率：a = (v − u) / t，u 为初速度，v 为末速度。匀加速运动的方程包括 v = u + a t 和 v² = u² + 2 a s。
Distance–time and velocity–time graphs are essential visual tools. The gradient of a distance–time graph gives speed, while a horizontal line indicates the object is stationary. For a velocity–time graph, the gradient represents acceleration, and the area under the graph equals the displacement travelled.
距离–时间图像和速度–时间图像是重要的分析工具。距离–时间图像的斜率表示速率，水平线段表示物体静止。速度–时间图像的斜率表示加速度，图像与坐标轴围成的面积等于位移。
2. Forces and Newton’s Laws | 力与牛顿定律
A force is a push or a pull that can change an object’s shape, speed or direction. Newton’s First Law states that an object remains at rest or moves with constant velocity unless a resultant force acts on it. Newton’s Second Law links resultant force, mass and acceleration: F = m a. Newton’s Third Law reminds us that forces always occur in pairs — if object A exerts a force on object B, B exerts an equal and opposite force on A.
力是能改变物体形状、速度或方向的推或拉。牛顿第一定律指出，物体在不受合力作用时将保持静止或匀速直线运动状态。牛顿第二定律给出了合力、质量和加速度之间的关系：F = m a。牛顿第三定律强调力总是成对出现——若 A 对 B 施加力，则 B 同时对 A 施加大小相等、方向相反的力。
Weight is the gravitational force on a mass: W = m g. Friction opposes motion. The moment of a force measures its turning effect and is given by M = F d, where d is the perpendicular distance from the pivot. An object is in equilibrium when the resultant force and resultant moment are both zero.
重力是作用在物体上的引力：W = m g。摩擦力阻碍运动。力矩衡量力的转动效果，公式为 M = F d，d 为力到支点的垂直距离。当合力和合力矩都为零时，物体处于平衡状态。
3. Energy, Work and Power | 能量、功和功率
Energy can exist as kinetic, gravitational potential, elastic potential, thermal, chemical, nuclear and more. The principle of conservation of energy tells us that energy cannot be created or destroyed; it can only be transferred from one store to another or transformed into different forms.
能量可以表现为动能、重力势能、弹性势能、热能、化学能、核能等多种形式。能量守恒定律告诉我们，能量既不能被创造也不能被消灭，只能从一个能量库转移到另一个，或从一种形式转化为另一种形式。
Work is done when a force moves an object: W = F d (distance moved in the direction of the force). Kinetic energy is KE = ½ m v², and gravitational potential energy is GPE = m g h. Power is the rate of doing work: P = W / t. Efficiency compares useful output energy to total input energy: efficiency = (useful energy output / total energy input) × 100%.
当力使物体沿力的方向移动时即做功：W = F d。动能 KE = ½ m v²，重力势能 GPE = m g h。功率是做功的速率：P = W / t。效率用于比较有用输出能量与总输入能量：效率 = （有用能量输出 / 总能量输入）× 100%。
4. Thermal Physics | 热物理
Temperature reflects the average kinetic energy of the particles in a substance. Heat is the transfer of thermal energy from a hotter region to a cooler one. The specific heat capacity c of a material is the energy needed to raise the temperature of 1 kg of the substance by 1 °C: c = ΔE / (m Δθ).
温度反映了物质内粒子的平均动能。热量是从高温区域向低温区域传递的热能。物质的比热容 c 是指 1 千克该物质升高 1 °C 所需的能量：c = ΔE / (m Δθ)。
During a change of state, the temperature remains constant while energy is absorbed or released. The specific latent heat L is the energy per kilogram required to change state without a temperature change: L = E / m. The kinetic particle model explains properties of solids, liquids and gases; evaporation differs from boiling, and gas pressure arises from particles colliding with container walls.
在物态变化过程中，温度保持恒定，但能量被吸收或释放。比潜热 L 是指每千克物质在温度不变时发生物态变化所需的能量：L = E / m。粒子动理论可以解释固体、液体和气体的性质；蒸发不同于沸腾，气体压强源于粒子与容器壁的碰撞。
5. Heat Transfer | 热传递
Thermal energy travels by three mechanisms: conduction, convection and radiation. Conduction occurs mainly in solids; vibrating particles pass energy to neighbours, and free electrons speed up the process. Good conductors include metals; insulators such as wood and plastic slow conduction.
热能通过三种方式传递：传导、对流和辐射。传导主要发生在固体中；振动的粒子将能量传递给相邻粒子，自由电子则加快这一过程。金属是良导体，木材和塑料等则是绝缘体，延缓传导。
Convection happens in liquids and gases: warmer, less dense fluid rises while cooler, denser fluid sinks, setting up a convection current. Radiation transfers energy via electromagnetic waves and does not need a medium. Dark, matte surfaces are good absorbers and emitters of radiation, whereas light, shiny surfaces are poor absorbers and reflectors.
对流发生在液体和气体中：受热后密度变小的流体会上升，而较冷、密度较大的流体会下沉，形成对流循环。辐射通过电磁波传递能量，无需介质。暗色、粗糙的表面是良好的辐射吸收体和发射体，而浅色、光亮的表面不易吸收，反射能力强。
6. General Wave Properties | 波的一般性质
Waves transfer energy from one place to another without transferring matter. In transverse waves, the particle oscillations are perpendicular to the direction of energy travel; examples include light and water waves. In longitudinal waves, the oscillations are parallel to the direction of energy travel; sound is a typical longitudinal wave.
波将能量从一处传递到另一处，但不传递物质。横波的粒子振动方向与能量传播方向垂直，如光波和水波。纵波的粒子振动方向与能量传播方向平行，声波是典型的纵波。
Key wave quantities include amplitude, wavelength (λ), frequency (f), period (T) and wave speed (v). They are related by v = f λ and T = 1 / f. Waves can undergo reflection, refraction and diffraction. A ripple tank can show these behaviours: straight ripples reflect from barriers, change direction when entering shallower water, and spread out when passing through a gap.
描述波的关键量有振幅、波长（λ）、频率（f）、周期（T）和波速（v）。它们之间的关系为 v = f λ 以及 T = 1 / f。波可以发生反射、折射和衍射。水波槽实验能展示这些现象：直条波纹从障碍物上反射，进入浅水区时方向改变，穿过狭缝时展宽。
7. Sound | 声音
Sound is a longitudinal wave produced by mechanical vibrations, requiring a medium such as air, water or solid to propagate. The speed of sound in air is roughly 330 m/s. The pitch of a sound is determined by its frequency, while the loudness depends on the amplitude of the wave.
声音是由机械振动产生的纵波，需要空气、水或固体等介质才能传播。声音在空气中的速度约为 330 m/s。音调由频率决定，响度则取决于波的振幅。
Echoes are reflected sound waves; the time delay between the original sound and its echo can be used to measure distances. Ultrasound has frequencies above 20 000 Hz, beyond human hearing. It is used in sonar ranging, medical scanning and industrial cleaning because it can be focused and partially reflected by boundaries between tissues or materials.
回声是声波的反射；利用原始声音和回声之间的时间差可以测量距离。超声波的频率高于 20 000 Hz，超出人耳听觉范围。它被用于声纳测距、医学成像和工业清洗，因为它易于聚焦，并且在组织或材料边界处会发生部分反射。
8. Electric Circuits | 电路
Electric current is the rate of flow of charge: I = Q / t. Voltage (potential difference) measures the work done per unit charge: V = W / Q. Resistance R = V / I, and for an ohmic conductor at constant temperature, the voltage is directly proportional to the current (V ∝ I).
电流是电荷流动的速率：I = Q / t。电压（电势差）衡量单位电荷所做的功：V = W / Q。电阻 R = V / I，对于温度不变的欧姆导体，电压与电流成正比（V ∝ I）。
Components can be connected in series or parallel. In a series circuit, the current is the same everywhere, and the supply voltage is shared across components. In a parallel circuit, each branch receives the full supply voltage, and the total current divides among the branches. The resistance of a wire increases with its length L and decreases with its cross-sectional area A: R = ρ L / A, where ρ is resistivity.
电路元件可以串联或并联。在串联电路中，电流处处相等，电源电压分配给各个元件。在并联电路中，每条支路两端的电压都等于电源电压，总电流在各支路中分配。导线的电阻随长度 L 增大而增大，随横截面积 A 增大而减小：R = ρ L / A，其中 ρ 为电阻率。
9. Magnetism and Electromagnetism | 磁性与电磁学
A magnet has a north (N) and a south (S) pole. Like poles repel, unlike poles attract. Permanent magnets are often made of steel; electromagnets consist of a coil of wire wound around a soft iron core and produce a magnetic field only while current flows through the coil.
磁体有北极（N）和南极（S）。同名磁极相互排斥，异名磁极相互吸引。永磁体通常由钢制成；电磁铁由缠绕在软铁芯上的线圈构成，只有在线圈通电时才产生磁场。
A straight current-carrying wire produces a circular magnetic field; the direction is given by the right-hand grip rule. A solenoid creates a strong, uniform field inside itself, similar to a bar magnet. The motor effect occurs when a current-carrying conductor is placed in an external magnetic field, causing a force on the conductor. Fleming’s left-hand rule predicts the direction of the force, and this principle is used in loudspeakers and electric motors.
通电直导线周围产生环形磁场，方向可由右手螺旋定则判断。螺线管内部产生类似于条形磁铁的强而均匀的磁场。电动机效应是指通电导线在外界磁场中会受到力的作用。弗莱明左手定则可判断该力的方向，这一原理应用于扬声器和电动机。
10. Atomic Physics | 原子物理基础
An atom consists of a tiny central nucleus containing protons and neutrons, surrounded by electrons arranged in shells. The proton number (atomic number, Z) defines the element. Isotopes have the same proton number but different neutron numbers, hence different mass numbers.
原子由一个微小的中心原子核（含质子和中子）以及按壳层分布的电子组成。质子数（原子序数 Z）决定了元素种类。同位素具有相同的质子数，但中子数不同，因此质量数也不同。
Some nuclei are unstable and emit radiation: alpha (α) particles (helium nuclei), beta (β) particles (fast electrons), and gamma (γ) rays (electromagnetic waves). The half-life of a radioactive isotope is the time taken for half the original nuclei to decay. Radioisotopes have uses such as medical tracers and radiotherapy, as well as monitoring the thickness of materials.
一些原子核不稳定，会放射出辐射：α 粒子（氦核）、β 粒子（高速电子）和 γ 射线（电磁波）。放射性同位素的半衰期是指原有原子核衰变一半所需的时间。放射性同位素可用于医学示踪、放射治疗以及材料厚度监测等。
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