📚 Core Knowledge for Year 10 Eduqas Physics | 10年级Eduqas物理核心知识点梳理
Welcome to your essential revision guide for Year 10 Eduqas Physics. This article covers the key ideas you need to master, from energy and electricity to forces, waves, and radioactivity. Each section is designed to help you check your understanding and build a solid foundation for your GCSE exams.
欢迎查看你的10年级Eduqas物理必修复习指南。本文涵盖了你需要掌握的核心概念，从能量和电学到力、波和放射性。每个部分都旨在帮助你检查自己的理解，为GCSE考试打下坚实基础。
1. Energy Stores and Transfers | 能量的储存与转移
Energy is never created or destroyed, only transferred between different stores. The main energy stores are kinetic, thermal, chemical, gravitational potential, elastic potential, and nuclear. Energy can be transferred by heating, by doing work, or by radiation.
能量既不会凭空产生也不会凭空消失，只会在不同储存库之间转移。主要的能量储存形式包括动能、热能、化学能、重力势能、弹性势能和核能。能量可以通过加热、做功或辐射的方式转移。
A system is an object or group of objects. When a system changes, energy is transferred. For example, when a ball is thrown upwards, kinetic energy is transferred to gravitational potential energy. In a stretched spring, elastic potential energy is stored.
系统是指一个物体或一组物体。当系统发生变化时，能量发生转移。例如，把球向上抛出时，动能转化为重力势能。弹簧被拉伸时，储存了弹性势能。
The principle of conservation of energy can be written as:
能量守恒定律可以表示为：
Total energy in = Total energy out
Energy is measured in joules (J). Understanding energy transfers helps us analyse mechanical systems, electrical appliances, and heating processes.
能量的单位是焦耳（J）。理解能量转移有助于我们分析机械系统、电器和加热过程。
2. Energy Resources and Efficiency | 能源与效率
Energy resources can be renewable or non-renewable. Non-renewable resources include fossil fuels (coal, oil, natural gas) and nuclear fuel. They are finite and will run out. Renewable resources, such as solar, wind, hydroelectric, wave, tidal, geothermal, and biomass, can be replenished and are often more sustainable.
能源可分为可再生和不可再生。不可再生资源包括化石燃料（煤、石油、天然气）和核燃料，储量有限，终将耗尽。可再生资源，如太阳能、风能、水力发电、波浪能、潮汐能、地热能和生物质能，能够再生，通常更具可持续性。
No energy transfer is 100% efficient. Some energy is always dissipated as thermal energy to the surroundings. Efficiency is the ratio of useful output energy to total input energy, often expressed as a percentage or a decimal. The formula is:
任何能量转移的效率都不可能达到100%。总有一部分能量以热能的形式耗散到周围环境中。效率是指有用输出能量与总输入能量的比值，通常用百分比或小数表示。计算公式为：
Efficiency = Useful output energy transfer ÷ Total input energy transfer
High efficiency means less wasted energy. Reducing unwanted energy transfers, for example through lubrication or thermal insulation, increases efficiency and helps conserve resources.
高效率意味着浪费的能量更少。减少不必要的能量转移，例如通过润滑或隔热，可以提高效率并有助于节约资源。
3. Electricity: Current, Voltage and Resistance | 电流、电压与电阻
Electric current is the flow of electric charge. In a metal wire, current is carried by moving electrons. Current (I) is measured in amperes (A). The size of current is the rate of flow of charge. Charge (Q) is measured in coulombs (C). The relationship is given by:
电流是电荷的流动。在金属导线中，电流由移动的电子承载。电流（I）的单位是安培（A）。电流的大小就是电荷流动的速率。电荷量（Q）的单位是库仑（C）。它们的关系式为：
Q = I × t
where t is time in seconds. In a closed circuit, a battery or power supply provides the potential difference (voltage) that pushes the charge around. Potential difference (V) is measured in volts (V) and is defined as the energy transferred per unit charge passed.
其中t是时间，单位为秒。在闭合电路中，电池或电源提供电势差（电压）来推动电荷移动。电势差（V）的单位是伏特（V），定义为每单位电荷转移的能量。
Resistance (R) opposes the flow of current and is measured in ohms (Ω). The potential difference, current, and resistance are connected by Ohm's law:
电阻（R）阻碍电流的流动，单位是欧姆（Ω）。电势差、电流和电阻之间的关系通过欧姆定律表述：
V = I × R
In series circuits, current is the same everywhere, but potential difference is shared. In parallel circuits, potential difference is the same across each branch, but current is split. These rules are essential for circuit analysis.
在串联电路中，各处电流相等，而电势差是分担的。在并联电路中，各支路两端的电势差相等，但电流是分流的。这些规则对于电路分析至关重要。
4. Circuit Components and Ohm's Law | 电路元件与欧姆定律
An ohmic conductor follows Ohm's law, meaning its resistance is constant provided the temperature remains constant. The current–potential difference graph for an ohmic conductor is a straight line through the origin. Non-ohmic components, such as filament lamps and diodes, do not have a constant resistance.
欧姆导体遵循欧姆定律，这意味着只要温度保持不变，其电阻就是恒定的。欧姆导体的电流-电势差图像是一条过原点的直线。非欧姆元件，如灯丝灯泡和二极管，其电阻不是恒定的。
A filament lamp gets hot as current increases, causing its resistance to rise. A diode allows current to flow in one direction only and has very high resistance in the reverse direction. A thermistor's resistance decreases as temperature increases, making it useful in temperature sensors. An LDR (light-dependent resistor) has a resistance that falls when light intensity increases, useful in automatic lights.
灯丝灯泡随着电流增大而变热，导致其电阻增大。二极管只允许电流在一个方向上流动，反向电阻极高。热敏电阻的阻值随温度升高而减小，可用于温度传感器。光敏电阻（LDR）的阻值随光照强度增加而减小，常用于自动照明电路。
In a series circuit, the total resistance is the sum of individual resistances: Rtotal sistance is less than the smallest individual resistance and can be found using the formula 1/Rtotal = 1/R₁ + 1/R₂. These relationships help predict circuit behaviour.
在串联电路中，总电阻等于各电阻之和：R总 = R₁ + R₂ + ... 在并联电路中，总电阻小于其中的最小电阻，可以通过公式 1/R总 = 1/R₁ + 1/R₂ 计算。这些关系有助于预测电路的行为。
5. Particle Model and Density | 粒子模型与密度
The particle model describes matter as made of tiny, moving particles. In solids, particles are closely packed in a regular arrangement and vibrate in fixed positions. In liquids, particles are close together but can slide past each other. In gases, particles are far apart and move rapidly in random directions.
粒子模型将物质描述为由微小的、不断运动的粒子组成。在固体中，粒子紧密排列且呈规则结构，只能在固定位置振动。在液体中，粒子相距很近，但可以相互滑动。在气体中，粒子间距很大，快速且无规则地向各个方向运动。
Density (ρ) is a measure of how much mass is packed into a given volume. It is calculated using:
密度（ρ）是度量单位体积内含有多少质量的物理量。计算公式为：
ρ = m ÷ V
where ρ is density in kg/m³, m is mass in kg, and V is volume in m³. A material with a high density has particles packed more tightly or heavier particles. The required practical for density involves measuring mass with a balance and volume by displacement or mathematical formulas for regular objects.
其中 ρ 为密度，单位为 kg/m³，m 为质量，单位为 kg，V 为体积，单位为 m³。高密度材料的粒子排列更紧密或粒子更重。关于密度的必做实验包括用天平测量质量，以及对于规则物体用数学公式计算体积，或通过排水法测量体积。
6. Changes of State and Internal Energy | 物态变化与内能
Substances can change state when heated or cooled. The six changes of state are melting (solid to liquid), freezing (liquid to solid), boiling or evaporation (liquid to gas), condensation (gas to liquid), sublimation (solid to gas), and deposition (gas to solid). During a change of state, the temperature of a pure substance remains constant while the change is taking place.
物质在加热或冷却时可以改变状态。六种物态变化分别是熔化（固→液）、凝固（液→固）、沸腾或蒸发（液→气）、冷凝（气→液）、升华（固→气）和凝华（气→固）。在物态变化过程中，纯净物的温度在变化完成前保持不变。
Internal energy is the total energy stored by the particles in a system. It is the sum of the kinetic energy (due to particle motion) and potential energy (due to the positions of particles in the force fields between them). Heating increases internal energy by increasing particle kinetic energy and/or potential energy.
内能是系统内粒子储存的总能量。它是动能（来自粒子运动）和势能（来自粒子间力场中的位置）之和。加热通过增加粒子的动能和/或势能来提高内能。
Specific latent heat is the energy needed to change the state of 1 kg of a substance without changing its temperature. Specific latent heat of fusion (Lf) is for melting/freezing, and specific latent heat of vaporisation (Lv) is for boiling/condensing. Energy required is given by:
比潜热是指使1 kg物质在温度不变的情况下改变状态所需的能量。熔化/凝固的比潜热称为熔解比潜热（Lf），沸腾/冷凝的比潜热称为汽化比潜热（Lv）。所需能量由下式给出：
E = m × L
where E is energy in J, m is mass in kg, and L is the specific latent heat in J/kg.
其中E为能量（J），m为质量（kg），L为比潜热（J/kg）。
7. Radioactivity and Atomic Structure | 放射性与原子结构
Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. 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.
原子由包含质子和中子的原子核以及核外分层排布的电子组成。原子序数（Z）是质子数，决定了元素的种类。质量数（A）是质子数与中子数的总和。同位素是质子数相同、中子数不同的同种元素的原子。
Some nuclei are unstable and emit radiation to become more stable. This is radioactive decay. The three main types of nuclear radiation are alpha (α), beta (β), and gamma (γ). Alpha particles are helium nuclei, highly ionising but poorly penetrating, stopped by paper. Beta particles are fast electrons, moderately ionising and penetrating, stopped by a few mm of aluminium. Gamma rays are electromagnetic waves, weakly ionising but very penetrating, reduced by thick lead or concrete.
某些原子核不稳定，会释放辐射以变得更加稳定，这就是放射性衰变。三种主要的核辐射类型是α（阿尔法）、β（贝塔）和γ（伽马）。α粒子是氦核，电离能力很强但穿透力很弱，可被纸阻挡。β粒子是快速电子，电离能力和穿透力中等，几毫米厚的铝即可阻挡。γ射线是电磁波，电离能力很弱但穿透力极强，厚铅板或混凝土可减弱其强度。
Radioactive decay is random. The half-life of a radioactive isotope is the time taken for half of the unstable nuclei in a sample to decay, or for the count rate to fall to half its initial value. Half-life can be used to predict how long a radioactive source will remain hazardous and is crucial for nuclear medicine and carbon dating.
放射性衰变是随机的。放射性同位素的半衰期是指样本中一半不稳定的原子核发生衰变，或计数率降至初始值一半所需的时间。半衰期可用于预测放射源保持危险性的时长，在核医学和碳定年法中至关重要。
8. Forces and Motion | 力与运动
Forces are vector quantities, meaning they have both magnitude and direction. Scalar quantities, like speed and energy, have magnitude only. Forces can change the speed, shape, or direction of an object. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by a resultant force.
力是矢量，既有大小又有方向。标量如速率和能量只有大小。力可以改变物体的速度、形状或运动方向。牛顿第一定律指出，除非受到合外力的作用，否则物体将保持静止或匀速直线运动状态。
Speed is a scalar measure of how fast something is moving. Velocity is speed in a given direction. Acceleration is the rate of change of velocity. The equations of motion for constant acceleration help calculate displacement (s), initial velocity (u), final velocity (v), acceleration (a), and time (t). Key relationships include:
速率是衡量物体运动快慢的标量。速度是带有方向的速率。加速度是速度变化的快慢。匀加速运动的运动学方程可帮助计算位移（s）、初速度（u）、末速度（v）、加速度（a）和时间（t）。关键关系式包括：
v = u + at
s = ut + ½at²
v² = u² + 2as
Newton' N). When multiple forces act on an object, their combined effect is the resultant force. Free body diagrams are used to visualise forces.
牛顿第二定律描述了合外力（F）、质量（m）和加速度（a）之间的关系：F = m × a。力的单位是牛顿（N）。当多个力作用在一个物体上时，它们的综合效果就是合力。受力分析图有助于直观显示各个力。
9. Wave Properties | 波的性质
Waves transfer energy from one place to another without transferring matter. Mechanical waves, such as sound and water waves, require a medium to travel. Electromagnetic waves, like light and radio waves, can travel through a vacuum. Waves can be transverse (oscillations perpendicular to the direction of energy transfer) or longitudinal (oscillations parallel to the direction).
波将能量从一处转移到另一处，但不转移物质。机械波（如声波和水波）需要介质才能传播。电磁波（如光波和无线电波）可以在真空中传播。波可以是横波（振动方向与能量传递方向垂直）或纵波（振动方向与能量传递方向平行）。
All waves have properties described by wavelength (λ), frequency (f), amplitude, and wave speed (v). Frequency is the number of complete waves passing a point per second, measured in hertz (Hz). The wave equation is:
所有波都具有波长（λ）、频率（f）、振幅和波速（v）等属性。频率是每秒通过某点的完整波的数量，单位为赫兹（Hz）。波的基本方程为：
v = f × λ
s can be reflected, refracted, and diffracted. Refraction occurs when a wave changes speed as it enters a new medium, causing it to change direction unless it enters along the normal. This is seen when light passes from air into glass.
波的周期（T）是完成一次完整振动所需的时间，等于频率的倒数：T = 1/f。波可以发生反射、折射和衍射。折射发生在波进入新介质时速度发生变化，从而导致波传播方向改变（除非沿法线入射）。例如光从空气射入玻璃时的现象。
10. Electromagnetic Waves and Applications | 电磁波及其应用
e spectrum is ordered by wavelength and frequency: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Radio waves have the longest wavelength and lowest frequency; gamma rays have the shortest wavelength and highest frequency.
电磁波谱是一系列连续的横波，在真空中的传播速度相同，约为 3.0 × 10⁸ m/s。按照波长和频率排序为：无线电波、微波、红外线、可见光、紫外线、X射线和伽马射线。无线电波波长最长、频率最低；伽马射线波长最短、频率最高。
Each region has distinct properties and uses. Radio waves are used for communication and broadcasting. Microwaves are used for satellite communication and cooking. Infrared is emitted by hot objects and used in thermal imaging and remote controls. Visible light is the small part of the spectrum detected by our eyes. Ultraviolet can cause skin tanning and is used in fluorescent lamps. X-rays are used in medical imaging and security. Gamma rays are used for sterilising medical equipment and cancer treatment.
各个波段具有独特的性质和用途。无线电波用于通信和广播。微波用于卫星通信和烹饪。红外线由热物体发出，用于热成像和遥控。可见光是我们眼睛能探测到的狭小波段。紫外线可使皮肤晒黑，并用于荧光灯。X射线用于医学成像和安检。伽马射线用于医疗设备消毒和癌症治疗。
All electromagnetic waves can be reflected, refracted, and absorbed. The energy they carry depends on their frequency; higher frequency waves carry more energy and can be harmful. It is important to use appropriate safety precautions when working with UV, X-rays, and gamma rays.
所有电磁波都可以发生反射、折射和被吸收。它们携带的能量取决于频率；频率越高，携带的能量越多，可能对人体造成伤害。在使用紫外线、X射线和伽马射线时，必须采取适当的安全防护措施。
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