📚 Core Knowledge Summary for Year 10 AQA Physics | Year 10 AQA 物理核心知识点梳理
This article covers the essential topics for Year 10 students following the AQA GCSE Physics specification. We summarise the core principles of energy, electricity, the particle model of matter, and atomic structure. Each section presents a key concept with clear explanations and paired bilingual paragraphs to support both English and Chinese learners.
本文梳理了AQA GCSE物理课程Year 10阶段的核心知识点，涵盖能量、电学、物质粒子模型和原子结构四大主题。每个小节都用中英双语配对讲解，帮助同学牢固掌握基本原理和重难点。
1. Energy Stores and Systems | 能量储存与系统
A system is an object or group of objects. Energy can be stored in different ways: kinetic, gravitational potential, elastic potential, thermal, chemical, magnetic, electrostatic, and nuclear stores. When a system changes, energy is transferred between stores, but the total energy is always conserved.
系统是指一个物体或一组物体。能量可以储存在不同的能量库中：动能、重力势能、弹性势能、内能（热能）、化学能、磁能、静电势能和核能。当系统发生变化时，能量在储存库之间转移，但总能量始终保持守恒。
- Energy is transferred mechanically (by a force), electrically, by heating, or by radiation.
- 能量通过做功（机械转移）、电流、加热或辐射的方式传递。
2. Calculating Kinetic and Gravitational Potential Energy | 动能与重力势能的计算
vitational potential energy (Ep) is stored when an object is raised above the ground: Ep = m × g × h, with g = 9.8 N/kg on Earth.
动能(Ek)是物体由于运动而具有的能量。公式为 Ek = ½ × m × v²，其中 m 为质量(kg)，v 为速度(m/s)。重力势能(Ep)是物体被抬高后储存的能量：Ep = m × g × h，地球上 g = 9.8 N/kg。
- If air resistance is ignored, a falling object converts Ep into Ek, and the sum remains constant.
- 忽略空气阻力时，下落的物体将 Ep 转化为 Ek，两者的总和保持不变。
3. Specific Heat Capacity | 比热容
J, m is mass in kg, c is specific heat capacity in J/(kg°C), and Δθ is temperature change in °C. Water has a high specific heat capacity, which makes it useful for thermal energy storage.
比热容(c)是指使1 kg物质温度升高1°C所需要的能量。公式为 ΔE = m × c × Δθ，ΔE 是热能(J)，m 是质量(kg)，c 是比热容(J/(kg°C))，Δθ 是温度变化(°C)。水的比热容很大，常用于储存热能。
| Substance / 物质 | Specific heat capacity (J/(kg°C)) |
|---|---|
| Water / 水 | 4200 |
| Aluminium / 铝 | 900 |
| Copper / 铜 | 385 |
4. Power and Efficiency | 功率与效率
lectrical appliances, P = I × V, where I is current and V is potential difference. Efficiency tells us how much useful energy is transferred: Efficiency = Useful output energy ÷ Total input energy. It is a ratio and can be given as a percentage.
功率是能量转移的速率。公式为 P = E ÷ t，P 功率(W)，E 能量(J)，t 时间(s)。对于电器，还可用 P = I × V 计算。效率描述有用能量所占的比例：效率 = 有用的输出能量 ÷ 总输入能量。它是一个比值，可用百分数表示。
- A perfect machine would have 100% efficiency, but real devices always waste some energy as thermal energy.
- 理想机器的效率为100%，但实际设备总有一部分能量以热能形式浪费。
5. Electric Current and Charge | 电流与电荷
e current is the rate of flow of charge: Q = I × t, where Q is charge in coulombs (C) and t is time in seconds. A complete loop is needed for current to flow.
电流是电荷的流动。金属中的载流子是自由电子。电流 I 的单位是安培(A)。电流的大小等于电荷流动的速率：Q = I × t，Q 电荷量(C)，t 时间(s)。电流必须在完整的闭合回路中才能流动。
- Conventional current flows from positive to negative, opposite to the electron flow direction.
- 习惯规定的电流方向是从正极到负极，与实际电子流动方向相反。
6. Potential Difference, Resistance and Ohm's Law | 电势差、电阻和欧姆定律
), where 1 V = 1 J/C. Resistance (R) measures how difficult it is for current to flow. Ohm' ment lamp increases as it gets hotter, while a diode only allows current in one direction.
电势差(V)是每单位电荷转移的能量，单位伏特(V)，1 V = 1 J/C。电阻(R)衡量电流流动的难易程度。欧姆定律指出，对固定电阻且温度不变时，V = I × R。灯丝的电阻随温度升高而增大；二极管只允许单向电流通过。
- A wire' ÷ I, and factors affecting resistance include length, cross-sectional area, and material.
- 导线的电阻用 R = V ÷ I 计算，影响电阻的因素有长度、横截面积和材料。
7. Series and Parallel Circuits | 串联与并联电路
In a series circuit, components are connected one after another. The current is the same at all points, the total resistance is the sum of individual resistances, and the supply potential difference is shared across components. In a parallel circuit, each component is connected on its own branch. The total current is the sum of branch currents, and the potential difference across each branch equals the supply voltage. Adding more resistors in parallel decreases the total resistance.
串联电路中的元件首尾相接。电流处处相等，总电阻等于各电阻之和，电源电压分配给各个元件。并联电路中，每个元件有单独支路。干路电流等于各支路电流之和，各支路两端的电压等于电源电压。并联的电阻越多，总电阻越小。
| Circuit type / 电路类型 | Current / 电流 | Potential difference / 电压 | Resistance / 电阻 |
|---|---|---|---|
| Series / 串联 | Same everywhere / 各处相等 | Shared / 分配 | Rtotal = R₁ + R₂ + … |
| Parallel / 并联 | Split between branches / 分支之和 | Same across each branch / 各支路相等 | 1/Rtotal = 1/R₁ + 1/R₂ + … |
8. Energy Transfers in Circuits | 电路中的能量转移
: E = Q × V. Combined with Q = I × t, we also have E = I × V × t. In a resistor, this energy is transferred to the thermal store of the resistor and surroundings (often called Joule heating).
电荷流过元件时会发生能量转移。能量大小取决于电荷量和电势差：E = Q × V。结合 Q = I × t，也可得 E = I × V × t。在电阻上，电能转化为电阻和周围环境的内能（常称为焦耳热）。
- The power rating of appliances (e.g. 2 kW kettle) shows the rate of energy transfer. A higher power means more energy transferred per second.
- 电器的额定功率（如2 kW烧水壶）表示能量转移的速率。功率越大，每秒转移的能量越多。
9. Density and the Particle Model | 密度与粒子模型
e particle model explains the properties of solids, liquids, and gases in terms of arrangement, movement, and energy of particles. Solids have a fixed shape and volume with particles tightly packed in a regular pattern. Liquids have a fixed volume but take the shape of their container, with particles close together but able to move past each other. Gases have no fixed shape or volume, with particles widely spaced and moving randomly at high speed.
密度(ρ)是单位体积的质量：ρ = m ÷ V，常用单位 kg/m³。粒子模型从粒子的排列、运动和能量角度解释固体、液体和气体的性质。固体有固定的形状和体积，粒子紧密排列且规则；液体体积固定但形状随容器改变，粒子紧密接触但可滑动；气体无固定形状和体积，粒子间距很大且高速随机运动。
- The density of an object can be measured using a balance and a measuring cylinder, or by using the displacement method for irregular solids.
- 物体的密度可用天平和量筒测量，不规则固体则可用排水法测量体积。
10. Internal Energy and Specific Latent Heat | 内能与比潜热
ing temperature. During a change of state (melting, boiling), energy is used to break bonds rather than raise temperature. The specific latent heat (L) is the energy needed to change the state of 1 kg of a substance without a temperature change: E = m × L. The specific latent heat of fusion refers to melting/freezing, and the specific latent heat of vaporisation refers to boiling/condensing.
内能是物质内部所有粒子的动能和势能之和。加热使粒子动能增加，温度升高。在物态变化时（熔化、沸腾），输入的能量用来打破粒子间的键而不是升高温度。比潜热(L)是使1 kg物质在温度不变的情况下改变状态所需的能量：E = m × L。熔化比潜热对应熔化/凝固，汽化比潜热对应沸腾/液化。
- When a substance condenses or freezes, it releases energy equal to the specific latent heat.
- 液化或凝固时，物质会释放与比潜热相等的能量。
11. Atomic Structure and Isotopes | 原子结构与同位素
10⁻¹⁰ m, while the nucleus is about 1 × 10⁻¹⁵ m. Atomic number is the number of protons; mass number is the total of protons and neutrons. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Some isotopes are unstable and decay, emitting radiation from the nucleus.
原子由一个致密的小原子核和分层排布的电子组成，原子核内有质子和中子。原子半径约为 1 × 10⁻¹⁰ m，原子核半径约为 1 × 10⁻¹⁵ m。原子序数等于质子数；质量数等于质子数加中子数。同位素是质子数相同、中子数不同的同种原子。某些同位素不稳定，会从原子核发出辐射而衰变。
- n +1, neutron 0, electron -1. Relative masses: proton ≈ 1, neutron ≈ 1, electron ≈ 1/1836.
- 电荷：质子 +1、中子 0、电子 -1。相对质量：质子 ≈ 1、中子 ≈ 1、电子 ≈ 1/1836。
12. Radioactive Decay and Half-life | 放射性衰变与半衰期
). Alpha particles have a strong ionising power but low penetration (stopped by paper). Beta particles can penetrate aluminium, while gamma rays are the most penetrating and require thick lead or concrete. The activity of a radioactive source is measured in becquerels (Bq), where 1 Bq = 1 decay per second.
不稳定的原子核通过发射α粒子（氦核）、β粒子（高速电子）或γ射线（电磁波）来衰变。α粒子电离能力强但穿透力弱，一张纸就能挡住；β粒子可穿透铝；γ射线穿透力最强，需厚铅板或混凝土阻挡。放射源的活度以贝克勒尔(Bq)为单位，1 Bq = 每秒衰变1次。
- Half-life is the time taken for the number of unstable nuclei in a sample to halve. It can be used to predict how quickly a radioactive substance decays.
- 半衰期是样品中不稳定原子核数量减半所需的时间，可用于预测放射性物质的衰减速度。
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