📚 Year 10 AQA Physics: Core Knowledge Review | Year 10 AQA 物理：核心知识点梳理
Year 10 is a pivotal stage in the AQA Physics journey, where learners build a solid foundation across energy, electricity, the particle model of matter, and atomic structure. This article brings together the essential concepts, key equations, and practical insights you need to master before moving on to Year 11. Each section is designed to reinforce what you learn in class and help you tackle exam‑style questions with confidence.
十年级是 AQA 物理学习的关键阶段，学生将在这一年打好能量、电学、粒子模型及原子结构等领域的扎实基础。本文梳理了进入十一年级前必须掌握的核心概念、重要公式和实践要点，每个板块都旨在巩固课堂所学，帮助你自信应对考试风格的题目。
1. Energy Stores and Systems | 能量储存与系统
Energy is never created or destroyed; it is transferred between different stores. A system is simply a single object or a group of objects you choose to analyse. Common energy stores include kinetic, thermal, chemical, gravitational potential, elastic potential, electrostatic, magnetic, and nuclear.
能量既不会凭空产生也不会凭空消失，它只在不同储存形式之间转移。系统即我们选定的单个物体或一组物体。常见的能量储存形式包括动能、内能、化学能、重力势能、弹性势能、静电势能、磁能和核能。
When a ball is dropped, energy is transferred from the gravitational potential store of the ball–Earth system to the kinetic store of the ball. We describe this process using the work‑done pathway when a force moves an object. Heating is another pathway, where energy moves from a hotter object to a cooler one.
当小球下落时，能量从小球—地球系统的重力势能储存转移到小球的动能储存。若力使物体移动，我们可用做功这一过程来描述。热传递是另一条途径，能量从温度高的物体传向温度低的物体。
Always define the system clearly when analysing energy transfers. A closed system is one where no energy can enter or leave the net, so the total energy remains constant.
分析能量转移时务必明确所研究的系统。封闭系统指没有能量能进入或离开其净量，因此总能量保持不变。
2. Conservation of Energy and Calculations | 能量守恒与计算
The principle of conservation of energy states that the total energy of a closed system remains constant. Enerpy can be transferred usefully, stored, or dissipated—but it is never used up. This is the foundation of every energy calculation in GCSE Physics.
能量守恒定律指出，封闭系统的总能量保持不变。能量可以被有效转移、储存或散失，但绝不会被 “用光”。这是 GCSE 物理中所有能量计算的基础。
nge in height (m). Elastic potential energy Eₑ = ½ k e², where k is the spring constant (N/m) and e is extension (m).
动能 Eₖ = ½ m v²，m 为质量（kg），v 为速度（m/s）。重力势能 Eₚ = m g h，g 取地球表面约 9.8 N/kg，h 为高度变化（m）。弹性势能 Eₑ = ½ k e²，k 为弹簧系数（N/m），e 为伸长量（m）。
resistance is present, some energy is transferred to the thermal store of the surroundings— issipation. Efficiency = useful output energy transfer ÷ total input energy transfer (×100% if a percentage is required). No device is 100% efficient.
当存在摩擦或空气阻力时，部分能量转移到周围物体的内能中——这称为能量散失。效率 = 有用输出能量转移 ÷ 总输入能量转移（若以百分比表示可乘 100%）。没有任何装置的效率可达 100%。
3. Energy Resources | 能源
The world's energy demands are met through a mix of renewable and non‑renewable resources. Non‑renewable resources include fossil fuels (coal, oil, natural gas) and nuclear fuel. Fossil fuels are burned to release chemical energy, which heats water to drive turbines. Nuclear fuel undergoes fission to produce heat in a similar way.
世界能源需求通过可再生能源与不可再生能源的混合来满足。不可再生能源包括化石燃料（煤、石油、天然气）和核燃料。化石燃料燃烧释放化学能，使水加热产生蒸汽驱动涡轮机；核燃料则通过裂变产生热量，原理相似。
Renewable resources—solar, wind, wave, tidal, hydroelectric, geothermal, and biomass—are replenished as they are used. They generally produce fewer greenhouse gases but have other environmental impacts and can be intermittent. Reliability, cost, and local geography influence which resource a country chooses.
可再生能源——太阳能、风能、波浪能、潮汐能、水力发电、地热能和生物质——在使用中可以得到补充。它们通常产生较少的温室气体，但具有其他环境影响，且可能不稳定。可靠性、成本和地理条件影响着各国对能源的选择。
Exam questions often ask you to compare the advantages and disadvantages of different energy resources for a specific scenario, so practise using full sentences that mention both the environmental and economic context.
考试常要求比较不同能源在特定场景下的优缺点，因此练习使用完整的句子，同时提及环境与经济背景。
4. Electric Current and Charge | 电流与电荷
: I = Q ÷ t, where Q is charge (coulombs) and t is time (seconds). The size of the current is determined by the potential difference and the resistance of the circuit.
电流是电荷的流动。在金属导线中，载流子是电子。电流 I（安培）是电荷流动的速率：I = Q ÷ t，Q 为电荷量（库仑），t 为时间（秒）。电流的大小由电位差和电路电阻共同决定。
For current to flow continuously, a complete circuit with a source of potential difference (e.g. a battery or power supply) is needed. By convention, current direction is opposite to the flow of electrons—from positive to negative terminal.
要使电流持续流动，必须有一个含有电位差源（如电池或电源）的完整回路。按照习惯，电流方向与电子流动方向相反——从正极流向负极。
In a series circuit, the current is the same at all points. In a parallel circuit, the total current from the source is shared between the branches. Ammeters are always connected in series to measure current.
串联电路中各处电流相等。并联电路中，电源总电流在各支路之间分配。安培计始终串联接入以测量电流。
5. Potential Difference and Resistance | 电位差与电阻
ne per unit charge between two points: V = W ÷ Q, where W is work done (joules). It is the 'push' that drives charge around a circuit. A voltmeter is connected in parallel to measure it.
电位差 V（伏特）是两点间每单位电荷所做的功：V = W ÷ Q，W 为做功（焦耳）。它是驱动电荷在电路中运动的 “推力”。电压表并联接入以测量电位差。
Resistance R (ohms, Ω) is a measure of how difficult it is for current to flow. Ohm' t constant temperature. The resistance of a component affects the current: the greater the resistance, the smaller the current for a given potential difference.
电阻 R（欧姆，Ω）衡量电流流通的难易程度。欧姆定律指出，在温度不变时，对电阻器有 V = I R。元件的电阻影响电流：给定电位差下，电阻越大，电流越小。
6. Series and Parallel Circuits | 串联与并联电路
In a series circuit, components are connected end‑to‑end. The total resistance is the sum of individual resistances: Rtotal = R₁ + R₂ + … rom the battery is shared between the components, and the current is identical everywhere.
串联电路中，元件首尾相连。总电阻等于各电阻之和：R总 = R₁ + R₂ + … 。电池提供的总电位差由各元件分担，各处电流相等。
In a parallel circuit, each component is connected directly to the power supply on its own loop. The potential difference across each branch is the same as the source voltage. The total current from the source equals the sum of the currents in the separate branches. Adding more branches reduces the total resistance, so the source current increases.
并联电路中，每个元件均通过独立的回路直接连接到电源。各支路两端的电位差相等且与电源电压相同。电源总电流等于各支路电流之和。增加支路会降低总电阻，因此电源电流增大。
Understanding these rules is essential for designing circuits and predicting what happens when one component fails. In a series circuit, if one lamp breaks, all lamps go out; in a parallel circuit, only that branch is affected.
理解这些规则对设计电路和预测元件故障的影响至关重要。在串联电路中，若一盏灯损坏，所有灯都熄灭；而在并联电路中，仅该支路受影响。
7. Mains Electricity and Safety | 市电与用电安全
Mains electricity in the UK is an alternating current (a.c.) with a potential difference of 230 V and a frequency of 50 Hz. The live wire carries the alternating potential from the supply. The neutral wire completes the circuit and is at, or near, earth potential (0 V). The earth wire is a safety wire connected to the ground.
英国市电为交流电，电位差为 230 V，频率为 50 Hz。火线传输电源的交流电位；中性线构成回路，保持或接近地电位（0 V）；地线是用来连接大地的安全导线。
Safety devices include fuses and circuit breakers, which disconnect the circuit if the current becomes too high. A fuse contains a thin wire that melts when the current exceeds its rating. Double insulation eliminates the need for an earth wire in appliances with a non‑conductive casing.
安全装置包括保险丝和断路器，它们在电流过大时断开电路。保险丝内含细金属线，当电流超过额定值时会熔断。对于外壳不导电的电器，双重绝缘可省去地线的需要。
is time (s). Power can also be found from P = I V. Electricity companies bill in kilowatt‑hours (kW h), where 1 kW h = 3.6 × 10⁶ J.
用电器所转移的能量可由 E = P t 计算，P 为功率（W），t 为时间（s）。功率也可由 P = I V 求得。电力公司以千瓦时（kW h）计费，1 kW h = 3.6 × 10⁶ J。
8. Particle Model and Density | 粒子模型与密度
The particle model explains the physical properties of solids, liquids, and gases. Solids have tightly packed, regularly arranged particles that vibrate about fixed positions. Liquids have particles that are close together but can move past each other. Gases have widely spaced particles moving randomly at high speed.
粒子模型解释了固体、液体和气体的物理性质。固体中粒子紧密堆积、排列规则，并在固定位置振动；液体粒子彼此靠近但能相互滑过；气体粒子间距很大，高速做无规则运动。
epends on what it is made of and how its particles are arranged. A regular solid’s volume can be found by geometry; an irregular solid’s volume is measured by displacement of water in a eureka can.
密度 ρ（kg/m³）是每单位体积的质量：ρ = m ÷ V。物体的密度取决于其材料及粒子排列方式。规则固体的体积可通过几何方法得到，不规则固体的体积可用尤里卡罐排水法测定。
9. Internal Energy, Specific Heat Capacity, and Latent Heat | 内能、比热容与潜热
he temperature (kinetic energy) or by changing state (potential energy). Specific heat capacity c (J/kg °C) is the energy required to raise the temperature of 1 kg of a substance by 1°C: ΔE = m c Δθ.
内能是物质中所有粒子的动能和势能之和。加热可通过升高温度（增加动能）或改变状态（增加势能）来提高内能。比热容 c（J/kg °C）是使 1 kg 物质升高 1°C 所需的能量：ΔE = m c Δθ。
Specific latent heat L (J/kg) is the energy needed to change the state of 1 kg of a substance without changing its temperature. Latent heat of fusion is for melting/freezing; latent heat of vaporisation is for boiling/condensing. During a change of state, the temperature stays constant while energy is absorbed or released.
比潜热 L（J/kg）是 1 kg 物质在温度不变时改变状态所需的能量。熔化/凝固对应熔解比潜热，沸腾/冷凝对应汽化比潜热。物态变化过程中，温度保持不变，能量被吸收或释放。
10. Atomic Structure | 原子结构
Atoms consist of a tiny, positively charged nucleus surrounded by electrons arranged in shells. The nucleus contains protons (positive) and neutrons (neutral). Most of the mass of an atom is concentrated in the nucleus, while the electrons occupy a volume much larger than the nucleus itself.
原子由极小的带正电的原子核与分层排布的电子组成。原子核内有质子（正电）和中子（不带电）。原子绝大部分质量集中在原子核，而电子占据的体积远大于原子核本身。
The atomic number (Z) is the number of protons, which determines the element. The mass number (A) is the total number of protons and neutrons. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
原子序数（Z）即质子数，决定元素种类。质量数（A）是质子与中子的总数。同位素是质子数相同而中子数不同的同种元素原子。
The historical development of the atomic model—from Dalton's solid spheres to Thomson's plum pudding, Rutherford's nuclear model, and Bohr's electron shells—shows how evidence refines scientific models. The discovery of the neutron by Chadwick completed the picture.
原子模型的发展——从道尔顿实心球体到汤姆孙枣糕模型，再从卢瑟福核式模型到玻尔电子壳层——展示了证据如何完善科学模型。查德威克发现中子使图像完整起来。
11. Radioactive Decay | 放射性衰变
Some atomic nuclei are unstable and can randomly emit radiation to become more stable. This process is called radioactive decay. The three main types of nuclear radiation are alpha (α), beta (β), and gamma (γ). Alpha particles are helium nuclei (2 protons + 2 neutrons), beta particles are fast‑moving electrons, and gamma rays are electromagnetic waves.
有些原子核不稳定，可随机释放辐射变得更为稳定，这一过程称为放射性衰变。三种主要的核辐射为 α（阿尔法）、β（贝塔）和 γ（伽马）。α 粒子是氦核（2 个质子 + 2 个中子），β 粒子是高速运动的电子，γ 射线是电磁波。
Alpha is the most ionising but least penetrating; it can be stopped by a few centimetres of air or paper. Beta is moderately ionising and penetrating; it requires a few millimetres of aluminium to stop it. Gamma is the least ionising but most penetrating; thick lead or several metres of concrete are needed to reduce it.
α 电离能力最强但贯穿能力最弱，几厘米空气或一张纸即可阻挡。β 电离和贯穿能力居中，需数毫米铝板挡住。γ 电离最弱但贯穿最强，需厚铅块或数米混凝土才能减弱。
12. Nuclear Equations and Half‑life | 核方程与半衰期
Nuclear equations use mass and atomic numbers to represent radioactive decay. In alpha decay, the mass number decreases by 4 and the atomic number by 2. In beta decay, a neutron turns into a proton and an electron; the mass number stays the same while the atomic number increases by 1.
核方程用质量数和原子序数表示放射性衰变。α 衰变中，质量数减少 4，原子序数减少 2。β 衰变中，一个中子变为一个质子和一个电子；质量数不变而原子序数增加 1。
The half‑life of a radioactive isotope is the average time taken for half the nuclei in a sample to decay, or for the count rate to halve. This value is constant for a given isotope and can be read from decay curves. Half‑life is used to determine the age of archaeological finds (carbon‑14 dating) or the safety of radioactive waste storage.
放射性同位素的半衰期是样品中半数原子核发生衰变或计数率减半所需的平均时间。对给定的同位素，该值为常数，可从衰变曲线上读取。半衰期可用于确定考古发现的年代（碳‑14 定年）或评估放射性废物储存的安全性。
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