📚 Year 11 AQA Physics: Mastering the Core Topics | 掌握核心知识点
Preparing for the Year 11 AQA Physics exams requires a solid grasp of key concepts across every topic. This guide breaks down the essential knowledge from energy, electricity, the particle model, atomic structure, forces, waves, magnetism and space physics, providing a clear and concise revision resource you can trust.
准备AQA物理考试需要扎实掌握所有主题的核心概念。本指南梳理了能量、电学、物质粒子模型、原子结构、力、波、磁学和空间物理中的重要知识点，为你提供清晰、可靠的复习资源。
1. Energy Stores and Transfers | 能量储存与转移
Energy cannot be created or destroyed; it is only ever transferred between different energy stores or moved from one object to another. The main stores are kinetic, thermal (internal), chemical, gravitational potential, elastic potential, electrostatic, magnetic and nuclear.
能量既不能被创造也不能被消灭，它只在不同能量储存之间转移，或从一个物体传到另一个物体。主要的能量储存类型有：动能、热能（内能）、化学能、重力势能、弹性势能、静电势能、磁能和核能。
Energy can be transferred by heating (conduction, convection, radiation), by waves (light, sound), by an electric current, or when a force moves an object (mechanical work). When a force does work, energy is transferred from one store to another – e.g. braking converts kinetic energy into thermal energy.
能量可以通过加热（传导、对流、辐射）、波（光、声）、电流或力移动物体（机械功）等方式转移。当力做功时，能量会从一个储存转移到另一个储存——例如刹车将动能转化为热能。
iciency is the ratio of useful output energy to total input energy, and can be expressed as a decimal or percentage.
你必须掌握的关键公式有：动能 = ½ m v²，重力势能 = m g h，功率 = 能量转移 ÷ 时间。效率是指有用输出能量与总输入能量的比值，可以用小数或百分比表示。
KE = ½ m v² GPE = m g h E = P t
Efficiency = Useful output energy ÷ Total input energy
2. Electricity and Circuits | 电学与电路
is the energy transferred per unit charge, and resistance opposes the flow of current. Ohm's Law states that V = I × R for ohmic conductors at constant temperature.
电流是电荷流动的速率。在单一闭合回路中，电流处处相等。电势差（电压）是每单位电荷转移的能量，电阻阻碍电流流动。欧姆定律表明，对于温度恒定的欧姆导体，V = I × R。
Components such as diodes and filament lamps do not follow Ohm's law because their resistance changes with current or temperature. In a series circuit, current is the same and voltages add; in a parallel circuit, voltage is the same across each branch and currents split.
像二极管和灯丝灯泡这样的元件并不遵守欧姆定律，因为它们的电阻会随电流或温度变化。在串联电路中，电流处处相等，电压相加；在并联电路中，各支路电压相等，电流分流。
National Grid uses step-up and step-down transformers to transmit electricity at high voltage, reducing energy wasted as heat in power lines.
电路中的电功率可用 P = I V 和 P = I² R 计算。转移的总能量为 E = P t。国家电网通过升压和降压变压器以高电压输电，从而减少输电线上以热量形式浪费的能量。
V = I R P = I V E = I V t
3. Particle Model of Matter | 物质粒子模型
V). The particle model explains the differences in density and behaviour of solids, liquids and gases. Solids have fixed, closely packed particles; liquids have close but mobile particles; gases have particles far apart moving randomly.
密度是单位体积的质量（ρ = m / V）。粒子模型解释了固体、液体和气体在密度和行为上的差异。固体的粒子紧密排列、位置固定；液体的粒子紧密但可移动；气体的粒子相距很远，随机运动。
of state. The specific heat capacity (c) tells you how much energy is needed to raise the temperature of 1 kg of a substance by 1 °C: ΔE = m c Δθ.
内能是系统中所有粒子的动能和势能之和。加热会增加内能并可能导致物态变化。比热容（c）表示使 1 kg 物质温度升高 1 °C 所需的能量：ΔE = m c Δθ。
used by particles colliding with the walls of a container; increasing temperature increases particle speed and pressure at constant volume.
比潜热（L）是使 1 kg 物质在不改变温度的情况下发生物态变化所需的能量：ΔE = m L。气体压强是由粒子与容器壁碰撞引起的；温度升高会增加粒子运动速率，从而在体积恒定时增大压强。
ρ = m / V ΔE = m c Δθ ΔE = m L
4. Atomic Structure and Radioactivity | 原子结构与放射性
Atoms consist of a tiny, positively charged nucleus surrounded by electrons in energy levels. The nucleus contains protons and neutrons. Isotopes are atoms of the same element with different numbers of neutrons. The atomic (proton) number defines the element; the mass number is the total of protons and neutrons.
原子由一个极小的带正电的原子核和分层排布的电子组成。原子核包含质子和中子。同位素是同一元素中中子数不同的原子。原子序数（质子数）决定了元素；质量数是质子与中子数之和。
Some isotopes are unstable and emit ionising radiation: alpha particles (helium nuclei), beta particles (high-speed electrons), or gamma rays (electromagnetic waves). Alpha is the most ionising but least penetrating; gamma is the most penetrating. Radiation can be detected with a Geiger–Müller tube and measured as count rate.
某些同位素不稳定，会发出电离辐射：α 粒子（氦核）、β 粒子（高速电子）或 γ 射线（电磁波）。α 电离能力最强但穿透力最弱；γ 穿透力最强。辐射可用盖革-米勒管探测，并用计数率衡量。
Radioactive decay is random, and the half-life is the time taken for half the unstable nuclei in a sample to decay. Nuclear equations must balance mass and atomic numbers. Nuclear fission is the splitting of a heavy nucleus, releasing energy; nuclear fusion joins light nuclei, releasing enormous energy – both can be shown in equations.
放射性衰变是随机的，半衰期是样本中一半不稳定原子核发生衰变所需的时间。核反应方程必须满足质量数和电荷数守恒。核裂变是重核分裂释放能量；核聚变是轻核结合释放巨大能量——两者均可在方程中表示。
| Radiation | 辐射 | Penetration | 穿透力 | Ionising power | 电离力 |
|---|---|---|
| Alpha (α) | α 粒子 | Stopped by paper | 纸可阻挡 | Very high | 很高 |
| Beta (β) | β 粒子 | Stopped by thin aluminium | 薄铝片可阻挡 | Medium | 中等 |
| Gamma (γ) | γ 射线 | Reduced by thick lead | 厚铅减弱 | Low | 低 |
5. Forces and Motion | 力与运动
A force is a push or pull that can change an object's shape, speed or direction. Forces are vectors with magnitude and direction; distance, speed and mass are scalars. Contact forces (friction, tension) require touching; non-contact forces (gravity, magnetic) act at a distance.
力是能够改变物体形状、速度或方向的推或拉。力是矢量，既有大小又有方向；距离、速率和质量是标量。接触力（摩擦力、张力）需要接触；非接触力（重力、磁力）可隔空作用。
nt force causes acceleration: F = m a. Weight is the force due to gravity: W = m g. Newton' p = m v, and in a closed system total momentum before a collision equals total after (HT).
合力产生加速度：F = m a。重力是由引力产生的力：W = m g。牛顿第三定律指出，力以相互作用对出现，大小相等、方向相反但作用在不同物体上。动量 p = m v，在封闭系统中碰撞前的总动量等于碰撞后的总动量（仅高级内容）。
Motion can be described with velocity– ation and the area under the graph gives displacement. The equations of uniform motion (v² – + braking distance, and is affected by speed, reaction time, and road/vehicle conditions.
速度–时间图可描述运动，其斜率表示加速度，图线下面积表示位移。匀加速运动方程（如 v² – u² = 2 a s, v = u + a t 等）用于恒定加速度的情况。制动距离 = 反应距离 + 刹车距离，受车速、反应时间和路况/车况影响。
F = m a W = m g p = m v
6. Waves | 波
dinal waves (sound, seismic P-waves) oscillate parallel. The electromagnetic spectrum is a family of transverse waves that all travel at 3 × 10⁸ m/s in a vacuum.
波传递能量而不传递物质。横波（光、水波）振动方向与能量传播方向垂直；纵波（声波、地震P波）振动方向平行。电磁波谱是一系列横波，在真空中均以 3 × 10⁸ m/s 的速度传播。
ave speed, f is frequency and λ is wavelength. Reflection and refraction are explained by waves changing speed at a boundary; sound waves reflect as echoes and ultrasound has medical and industrial uses. Seismic P-waves and S-waves provide evidence about the Earth's internal structure.
波动方程为 v = f λ，v 为波速，f 为频率，λ 为波长。反射和折射可由波在界面处改变速度来解释；声波反射产生回声，超声波有医学和工业用途。地震P波和S波提供了地球内部结构的证据。
All bodies emit and absorb electromagnetic radiation. The intensity and peak wavelength depend on temperature – an ideal black body absorbs all radiation and emits radiation across a continuous spectrum (HT). Light can be detected by the eye, and colour filters work by transmitting their own colour and absorbing others.
所有物体都会发射和吸收电磁辐射。辐射强度和峰值波长取决于温度——理想黑体能吸收所有辐射并发射连续光谱（仅高级内容）。光可被人眼检测，颜色滤光片通过透射自身颜色并吸收其他颜色来起作用。
v = f λ
7. Magnetism and Electromagnetism | 磁学与电磁学
Magnets have north and south poles; like poles repel, unlike poles attract. A current-carrying wire produces a circular magnetic field, which forms the basis of electromagnets – a coil (solenoid) with an iron core greatly strengthens the field. Electromagnets are used in relays, electric bells and lifting magnets.
磁体有 N 极和 S 极；同名磁极相斥，异名相吸。载流导线产生圆形磁场，这是电磁铁的基础——带铁心的线圈（螺线管）极大增强磁场。电磁铁用于继电器、电铃和起重磁铁。
The motor effect occurs when a current-carrying conductor is placed in an external magnetic field, producing a force. Fleming's left-hand rule gives the direction of force, field and current. Electric motors use this effect to produce continuous rotation. The generator effect states that moving a conductor through a magnetic field (or changing the field) induces a potential difference, creating an alternating current if the motion is repeated.
电动机效应是指载流导体置于外磁场中会产生力。弗莱明左手定则给出了力、磁场和电流的方向。电动机利用此效应产生持续转动。发电机效应表明，导体在磁场中运动（或改变磁场）会感应出电动势，若运动重复则产生交流电。
hange the potential difference of an alternating current: Vₚ / Vₛ = Nₚ / Nₛ (HT). For an ideal transformer, input power equals output power: Vₚ Iₚ = Vₛ Iₛ.
交流发电机产生交流电，而直流发电机通过分裂式换向器产生直流电。变压器能改变交流电的电压：Vₚ / Vₛ = Nₚ / Nₛ（仅高级内容）。对于理想变压器，输入功率等于输出功率：Vₚ Iₚ = Vₛ Iₛ。
Vₚ / Vₛ = Nₚ / Nₛ Vₚ Iₚ = Vₛ Iₛ
8. Space Physics | 空间物理
The Solar System consists of the Sun, planets, dwarf planets, moons, asteroids and comets. Planets orbit the Sun in near-circular ellipses, held in place by gravity. For a stable orbit, the gravitational force provides the required centripetal force, so orbital speed and radius are related (HT).
太阳系由太阳、行星、矮行星、卫星、小行星和彗星组成。行星在近似圆形的椭圆轨道上绕太阳运行，靠引力维系。在稳定轨道中，引力提供所需的向心力，因此轨道速度与半径相关（仅高级内容）。
A star forms from a cloud of dust and gas (nebula) that collapses under gravity, causing fusion of hydrogen into helium. The star then enters a long stable main sequence phase. Low-mass stars eventually become red giants, then white dwarfs with a planetary nebula. High-mass stars become red supergiants and end in a supernova, forming neutron stars or black holes.
恒星由尘埃和气体云（星云）在引力作用下塌缩形成，引发氢聚变为氦。随后恒星进入漫长稳定的主序星阶段。低质量恒星最终变为红巨星，再演化成白矮星并伴随行星状星云。大质量恒星成为红超巨星，以超新星爆发结束，形成中子星或黑洞。
Red-shift is observed when light from distant galaxies is shifted towards longer wavelengths, indicating that galaxies are moving away from us. This supports the Big Bang theory – the universe began from a hot, dense point and has been expanding ever since. Observations also suggest the existence of dark matter and dark energy, which affect the universe's expansion.
红移是指遥远星系的光向长波长方向偏移，表明星系正在离我们远去。这支持了大爆炸理论——宇宙从一个极热极密的点开始，并不断膨胀至今。观测还暗示存在暗物质和暗能量，它们影响宇宙的膨胀。
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