📚 Year 11 Eduqas Physics: Core Content Summary | 11年级 Eduqas 物理：核心知识点梳理
This article provides a concise summary of the key topics covered in Year 11 Eduqas Physics, designed to help students review the essential concepts, equations, and applications needed for their exams. Each section pairs a clear English explanation with a Chinese equivalent to support bilingual learners.
本文简明梳理11年级 Eduqas 物理的核心知识点，涵盖考试所需的重要概念、公式和应用，每个要点均配有中英文双语解释，方便双语学习者巩固复习。
1. Motion and Forces | 运动与力
Speed is a scalar quantity measuring how fast an object moves, while velocity is a vector that includes direction. Acceleration is the rate of change of velocity.
速率是标量，描述物体运动的快慢；速度是矢量，包含方向。加速度是速度的变化率。
The equations of motion for constant acceleration are: v = u + at, s = (u+v)t/2, v² = u² + 2as, and s = ut + ½at². Newton’s First Law states that an object remains at rest or in uniform motion unless acted on by a resultant force.
匀加速直线运动的公式为：v = u + at、s = (u+v)t/2、v² = u² + 2as 和 s = ut + ½at²。牛顿第一定律指出，物体在不受合力作用时保持静止或匀速直线运动。
Newton’s Second Law gives F = ma. Inertial mass is a measure of an object’s resistance to acceleration. Newton’s Third Law explains that forces always occur in equal and opposite pairs acting on different objects.
牛顿第二定律 F = ma 将合力、质量与加速度联系起来。惯性质量衡量物体抵抗加速的能力。牛顿第三定律说明力总是成对出现，大小相等、方向相反，作用在不同物体上。
Momentum p = mv is conserved in a closed system. Force equals rate of change of momentum: F = Δp/Δt. In collisions, safety features like airbags increase impact time to reduce force.
动量 p = mv 在封闭系统中守恒。力等于动量变化率：F = Δp/Δt。碰撞中，安全气囊等装置通过延长作用时间减小冲击力。
2. Energy Stores and Transfers | 能量储存与转移
Energy is stored in kinetic, gravitational potential (Ep = mgh), elastic potential (Ee = ½kx²), thermal, chemical, nuclear, electromagnetic, and electrostatic stores. Energy is transferred mechanically, electrically, by heating, or by radiation.
能量储存形式包括动能、重力势能（Ep = mgh）、弹性势能（Ee = ½kx²）、热能、化学能、核能、电磁能和静电能。能量通过机械做功、电流、加热或辐射等方式转移。
Work done (W = Fd) is the energy transferred when a force moves an object. Power (P = W/t or P = E/t) measures the rate of energy transfer. Efficiency = useful output / total input, and no device can be more than 100% efficient.
功（W = Fd）是力使物体移动时转移的能量。功率（P = W/t 或 P = E/t）表示能量转移的快慢。效率 = 有用输出 / 总输入，任何设备效率都不可能超过100%。
Renewable energy resources include solar, wind, tidal, hydroelectric, wave, and geothermal. Non‑renewables are fossil fuels and nuclear fuel. Choosing an energy source involves comparing reliability, cost, environmental impact, and energy density.
可再生能源包括太阳能、风能、潮汐能、水电、波浪能和地热能。不可再生能源为化石燃料和核燃料。选择能源需权衡可靠性、成本、环境影响和能量密度等因素。
3. Wave Properties and EM Spectrum | 波的性质与电磁波谱
Waves transfer energy without transferring matter. Transverse waves (e.g. light, water waves) oscillate perpendicular to the direction of travel; longitudinal waves (e.g. sound) oscillate parallel. Key quantities: amplitude, wavelength λ, frequency f, period T = 1/f, wave speed v = fλ.
波传递能量而不传递物质。横波（如光、水波）振动方向与传播方向垂直；纵波（如声波）振动与传播方向平行。基本物理量：振幅、波长 λ、频率 f、周期 T = 1/f、波速 v = fλ。
Reflection obeys the law: angle of incidence = angle of reflection. Refraction occurs when a wave changes speed crossing a boundary, causing a change of direction. The electromagnetic spectrum, in order of increasing frequency, is: radio, microwave, infrared, visible, ultraviolet, X‑ray, gamma.
反射遵循反射定律：入射角等于反射角。折射发生在波穿过不同介质且波速改变时，方向发生偏折。电磁波谱按频率递增排列为：无线电波、微波、红外线、可见光、紫外线、X射线、伽马射线。
Different EM waves have different uses: radio for communication, microwaves for cooking and radar, infrared for thermal imaging, visible for seeing, ultraviolet for tanning and sterilisation, X‑rays for medical imaging, gamma rays for cancer treatment.
不同电磁波用途各异：无线电波用于通信，微波用于烹饪和雷达，红外线用于热成像，可见光使人看见物体，紫外线用于晒黑和消毒，X射线用于医学成像，伽马射线用于癌症治疗。
4. Electricity and Circuits | 电路与电流
Current I = Q/t is the rate of flow of charge; in metals it is a flow of electrons. Potential difference V = E/Q is the energy transferred per coulomb. Resistance R = V/I, and Ohm’s law applies when temperature is constant.
电流 I = Q/t 是电荷流动的速率；在金属中为电子流动。电势差 V = E/Q 是每库仑电荷转移的能量。电阻 R = V/I，当温度恒定时适用欧姆定律。
Resistance increases in filament lamps as they heat, and decreases in thermistors with rising temperature. LDR resistance drops as light intensity increases. In series circuits: current same, voltages add, total resistance RT = R₁ + R₂. In parallel: currents split, voltage same, total resistance is less than the smallest.
灯丝电阻随温度升高而增大；热敏电阻随温度升高阻值减小；光敏电阻光照越强阻值越低。串联电路中电流处处相等，电压相加，总电阻 RT = R₁ + R₂。并联电路中电流分叉，电压相等，总电阻小于任一分支电阻。
Mains electricity in the UK is 230 V AC at 50 Hz. Domestic circuits use ring mains and fuses/circuit breakers for safety. Power P = IV, energy transferred E = IVt. The live wire is brown, neutral blue, earth wire green‑and‑yellow.
英国市电为 230 V、50 Hz 交流电。家庭电路采用环形干线，使用保险丝或断路器保护。功率 P = IV，能量 E = IVt。火线棕色，零线蓝色，地线绿黄相间。
5. Magnetism and Electromagnetism | 磁与电磁
Permanent magnets produce their own magnetic field; temporary magnets become magnetised in a field. Like poles repel, unlike attract. The magnetic field pattern can be shown with plotting compasses.
永磁体产生自有磁场；暂时磁体在磁场中被磁化。同性磁极相斥，异性相吸。可用小磁针描绘磁场分布。
An electromagnet is a solenoid with an iron core; its strength is increased by more current, more turns, or a soft iron core. The motor effect: a current‑carrying wire in a magnetic field experiences a force (F = BIL for perpendicular arrangements). Fleming’s Left‑Hand Rule predicts direction.
电磁铁是带铁芯的线圈；增大电流、增加匝数或使用软铁芯可增强磁力。电动机效应：通电导线在磁场中受力（垂直情况 F = BIL），用左手法则判断方向。
Electromagnetic induction: a changing magnetic field induces a potential difference across a conductor. An alternator produces AC; a dynamo produces DC using a split‑ring commutator. Transformers use a.c. to change voltage levels, following Vp/Vs = Np/Ns, and efficiency close to 100%.
电磁感应：变化的磁场在导体两端产生感应电动势。交流发电机产生交流电，直流发电机用整流子输出直流电。变压器利用交流电改变电压，满足 Vp/Vs = Np/Ns，效率接近100%。
6. Particle Model of Matter | 物质的粒子模型
Density ρ = m/V describes mass per unit volume. Solids, liquids and gases have different arrangements and motions of particles. Changes of state are physical changes: melting, boiling, condensing, freezing, sublimating.
密度 ρ = m/V 表示单位体积的质量。固、液、气三态粒子排列与运动不同。物态变化是物理变化：熔解、沸腾、凝结、凝固、升华。
Internal energy is the sum of kinetic and potential energies of particles. Heating increases internal energy; a change of state requires latent heat without temperature change. Specific latent heat L = E/m.
内能是粒子动能与势能的总和。加热提升内能；发生物态变化时需要潜热而温度不变。比潜热 L = E/m。
Gas pressure is caused by particles colliding with container walls. Increasing temperature at constant volume raises pressure (p ∝ T). Boyle’s law states pV = constant for a fixed mass of gas at constant temperature.
气体压强由粒子碰撞器壁产生。体积一定时，温度升高则压强增大（p ∝ T）。波义耳定律：一定质量气体在温度不变下，压强与体积成反比，pV = 常数。
7. Atomic Structure and Radioactivity | 原子结构与放射性
The atom contains a small positive nucleus (protons + neutrons) surrounded by electrons in energy levels. Atomic number Z = number of protons; mass number A = protons + neutrons. Isotopes have same Z but different A.
原子由微小正电核（质子+中子）与核外分层电子组成。原子序数 Z = 质子数；质量数 A = 质子数 + 中子数。同位素质子数相同而质量数不同。
Unstable nuclei emit radiation: alpha particles (helium nucleus, stopped by paper, highly ionising), beta particles (fast electron, stopped by aluminium, moderately ionising), gamma rays (EM wave, stopped by thick lead, weakly ionising). Radioactive decay is random.
不稳定核发射辐射：α粒子（氦核，纸可挡住，电离能力强）、β粒子（高速电子，铝片可挡，电离能力中等）、γ射线（电磁波，厚铅可挡，电离能力弱）。放射性衰变是随机发生的。
Activity is measured in becquerels (Bq). Half‑life is the time for half the nuclei in a sample to decay, or for activity to halve. Applications include medical tracers, radiotherapy, and carbon dating. Risks include mutation and cancer; safety measures include time, distance, shielding.
活度单位为贝克勒尔 (Bq)。半衰期是样品中一半原子核发生衰变，或活度减半所需的时间。应用有医用示踪剂、放射治疗和碳定年法。风险包括基因突变和癌症，安全措施为缩短时间、增大距离、使用屏蔽。
8. Nuclear Fission and Fusion | 核裂变与核聚变
Fission is the splitting of a large nucleus (e.g. uranium‑235) after absorbing a neutron, releasing energy and two or more neutrons that can cause a chain reaction. Control rods and moderators manage the reaction in nuclear reactors.
裂变是大核（如铀‑235）吸收中子后分裂，释放能量和两到三个中子，这些中子可引发链式反应。核反应堆用控制棒与慢化剂调控反应速率。
Fusion is the joining of light nuclei (e.g. hydrogen isotopes) to form helium, releasing huge energy. This is the process powering the Sun. Fusion requires extremely high temperatures and pressures to overcome electrostatic repulsion, and is not yet commercially viable on Earth.
聚变是轻核（如氢同位素）结合成氦的过程，释放巨大能量，这是太阳的能量来源。聚变需极高温度和压强以克服电荷排斥，目前地球上仍未实现商业发电。
9. Space Physics | 空间物理
Our Solar System contains the Sun, eight planets, moons, asteroids and comets. The orbits of planets are elliptical, but nearly circular. Gravity provides the centripetal force keeping objects in orbit: stronger gravity for larger masses and shorter distances.
太阳系包含太阳、八大行星、卫星、小行星和彗星。行星轨道为近似圆形的椭圆。引力提供向心力维持天体轨道运行：质量越大、距离越小，引力越强。
The life cycle of a star depends on its mass. A star like the Sun: nebula → protostar → main sequence → red giant → planetary nebula → white dwarf. A massive star: nebula → protostar → main sequence → red supergiant → supernova → neutron star or black hole. Fusion in stars produces elements up to iron.
恒星生命周期取决于质量。类似太阳的恒星：星云→原恒星→主序星→红巨星→行星状星云→白矮星。大质量恒星：星云→原恒星→主序星→红超巨星→超新星→中子星或黑洞。恒星内聚变产生铁以下的元素。
Redshift is observed when a light source moves away, stretching wavelength. Observations show distant galaxies are redshifted more, meaning the universe is expanding. This supports Big Bang theory, which states the universe began from a single point about 13.8 billion years ago. CMBR is leftover radiation from the early hot universe.
红移是光源远离时波长被拉长的现象。观测显示遥远星系红移更大，说明宇宙在膨胀。这支持大爆炸理论，认为宇宙约138亿年前从一个奇点诞生。宇宙微波背景辐射是早期炽热宇宙的余晖。
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