📚 Year 10 Edexcel Physics: Core Concepts Review | Edexcel 物理核心知识点梳理
Welcome to our comprehensive review of the essential topics in Year 10 Edexcel Physics. This guide covers the key concepts you need to master, from motion and forces to waves and radioactivity, with clear explanations and paired bilingual notes to help you succeed. Each section unpacks a core idea, shows how it's tested, and gives you the confidence to tackle both calculations and conceptual questions.
欢迎来到我们为 Year 10 Edexcel 物理准备的核心知识点梳理。本指南涵盖了你需要掌握的关键概念，从运动与力的关系到波与放射性，配有清晰的解释和中英双语对照笔记，助你取得好成绩。每个小节拆解一个核心知识点，展示其考查方式，让你有信心应对计算题和概念题。
1. Scalar and Vector Quantities | 标量与矢量
Physics deals with two fundamental types of quantities: scalars and vectors. Scalars have magnitude only, while vectors have both magnitude and direction. Common scalars include speed, distance, mass, time, and energy. Vectors include velocity, displacement, force, weight, and acceleration.
物理学处理两种基本类型的量：标量和矢量。标量只有大小，矢量既有大小又有方向。常见的标量包括速率、距离、质量、时间和能量。矢量包括速度、位移、力、重量和加速度。
When comparing displacement and distance, displacement is the straight-line distance in a specific direction from start to finish, whereas distance is the total path length traveled. A car driving around a roundabout may travel a large distance but end up with zero displacement if it returns to the start.
在比较位移与距离时，位移是从起点到终点的直线距离并指向特定方向，而距离是经过的总路径长度。一辆汽车绕环岛行驶可能走了很长的距离，但如果回到起点，位移则为零。
2. Speed and Acceleration | 速度与加速度
Average speed is the total distance traveled divided by the time taken. Acceleration is the rate of change of velocity. An object accelerates if it speeds up, slows down, or changes direction. The two core equations you must be completely familiar with are:
平均速率是总路程除以所用时间。加速度是速度变化的快慢。物体加速包括加速、减速或改变方向。你必须完全熟练的两个核心方程是：
v = d ÷ t
a = (v - u) ÷ t
Here, v is final velocity, u is initial velocity, d is distance, and t is time. In Edexcel exams you may also see 's' used for distance; both d and s are acceptable. Acceleration can be positive or negative (deceleration). The unit of acceleration is m/s².
这里，v 是末速度，u 是初速度，d 是距离，t 是时间。在 Edexcel 考试中你可能还会看到用 s 表示距离；d 和 s 都可以接受。加速度可以为正或负（减速）。加速度的单位是米每二次方秒（m/s²）。
3. Distance-Time and Velocity-Time Graphs | 距离-时间图与速度-时间图
Motion graphs are a powerful tool for analysing movement. A distance-time graph plots distance on the y-axis against time on the x-axis. The gradient of the line gives the speed: a steeper gradient means a higher speed. A horizontal line indicates the object is stationary.
运动图像是分析运动的有力工具。距离-时间图以 y 轴表示距离，x 轴表示时间。线的斜率给出速率：斜率越陡，速率越高。水平线表示物体处于静止状态。
A velocity-time graph plots velocity against time. The gradient gives acceleration, and the area under the graph gives the distance traveled (or displacement if direction is constant). A horizontal line means constant velocity, an upward sloping line indicates acceleration, and a downward sloping line indicates deceleration.
速度-时间图以速度对时间作图。斜率给出加速度，图线下的面积给出经过的距离（如果方向不变则为位移）。水平线表示匀速，向上倾斜的线表示加速，向下倾斜的线表示减速。
4. Newton's First Law and Inertia | 牛顿第一定律与惯性
Newton's First Law states that an object will remain at rest, or continue to move in a straight line at a constant speed, unless acted upon by an unbalanced external force. This property of an object to resist changes in its state of motion is called inertia.
牛顿第一定律指出，除非受到不平衡的外力作用，否则物体将保持静止状态或沿直线以恒定速度继续运动。物体抵抗运动状态变化的这种性质称为惯性。
Inertia depends on mass: the more mass an object has, the greater its inertia, and the harder it is to accelerate or decelerate. When a car brakes sharply, passengers lurch forward because their bodies tend to continue moving forward due to inertia.
惯性取决于质量：物体的质量越大，惯性越大，越难使其加速或减速。汽车急刹车时，乘客会向前倾，这是因为人体因惯性趋向于保持原来的向前运动。
5. Newton's Second Law | 牛顿第二定律
Newton's Second Law describes the relationship between force, mass, and acceleration. It can be summarised by the equation:
牛顿第二定律描述了力、质量与加速度之间的关系。它可以用以下方程概括：
F = m × a
where F is the resultant force in newtons (N), m is mass in kilograms (kg), and a is acceleration in metres per second squared (m/s²). The acceleration is always in the same direction as the resultant force.
其中 F 是合力，单位为牛顿（N），m 是质量，单位为千克（kg），a 是加速度，单位为米每二次方秒（m/s²）。加速度总是与合力的方向相同。
This law explains why it takes a larger force to accelerate a more massive object, and why a small force produces only a small acceleration. It can also be rearranged to find mass or acceleration when the other quantities are known.
该定律解释了为什么使质量更大的物体加速需要更大的力，以及为什么小的力只能产生小的加速度。当已知其他量时，该公式可以变形以求出质量或加速度。
6. Work and Energy Transfers | 功与能量转化
Work is done when a force moves an object through a distance. The amount of work done is equal to the energy transferred. The key equation is:
当力使物体移动一段距离时，就做了功。做功的量等于转移的能量。关键方程是：
W = F × d
Work done W is measured in joules (J), force F in newtons (N), and distance d in metres (m). One joule is the work done when a force of 1 N moves an object 1 m in the direction of the force.
做功 W 以焦耳（J）为单位，力 F 以牛顿（N）为单位，距离 d 以米（m）为单位。1 焦耳是 1 牛顿的力使物体沿力的方向移动 1 米时所做的功。
Energy can be transferred mechanically (by forces), electrically, by heating, or by radiation. The principle of conservation of energy states that energy can be transferred usefully, stored or dissipated, but cannot be created or destroyed. Efficiency is the ratio of useful output energy to total input energy.
能量可以通过做功（力）、电、加热或辐射进行转移。能量守恒原理指出，能量可以被有效转移、储存或耗散，但不能被创造或毁灭。效率是有用输出能量与总输入能量之比。
7. Gravitational Potential Energy and Kinetic Energy | 重力势能与动能
Objects gain gravitational potential energy (GPE) when they are lifted against gravity. The GPE stored depends on mass, gravitational field strength, and height:
当物体克服重力被抬高时，会获得重力势能（GPE）。储存的重力势能取决于质量、重力场强度和高度：
GPE = m × g × h
strength (≈10 N/kg on Earth, unless specified otherwise in the exam), and h is height (m).
其中 m 是质量（kg），g 是重力场强度（地球上约为 10 N/kg，除非考卷另有说明），h 是高度（m）。
Kinetic energy (KE) is the energy an object possesses due to its motion:
动能（KE）是物体因运动而具有的能量：
KE = ½ × m × v²
When an object falls, GPE is converted into KE. In the absence of air resistance, the total energy remains constant (energy conservation).
当物体下落时，重力势能转化为动能。在没有空气阻力的情况下，总能量保持不变（能量守恒）。
8. Wave Properties | 波的性质
Waves transfer energy without transferring matter. All waves have a wavelength (λ), frequency (f), amplitude, and wave speed (v). The wave equation links these quantities:
波传递能量而不传递物质。所有波都有波长（λ）、频率（f）、振幅和波速（v）。波动方程将这些量联系起来：
v = f × λ
Frequency is measured in hertz (Hz), wavelength in metres (m), and wave speed in metres per second (m/s). Transverse waves (e.g. light, water ripples) have oscillations perpendicular to the direction of energy transfer. Longitudinal waves (e.g. sound) have oscillations parallel to the direction of energy transfer, creating compressions and rarefactions.
频率的单位是赫兹（Hz），波长的单位是米（m），波速的单位是米每秒（m/s）。横波（如光、水纹）的振动方向与能量传递方向垂直。纵波（如声音）的振动方向与能量传递方向平行，形成密部和疏部。
You should be able to measure the speed of sound and water ripples in practical investigations. Reflection, refraction, and diffraction are all wave behaviours you will encounter.
你应该能够在实验研究中测量声速和水波速度。反射、折射和衍射都是你会接触到的波的特性。
9. The Electromagnetic Spectrum | 电磁波谱
order of increasing frequency (and decreasing wavelength), is: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
电磁波谱是一个连续的横波范围，所有电磁波在真空中传播速度相同（3.0 × 10⁸ m/s）。按照频率递增（波长递减）的顺序，谱为：无线电波、微波、红外线、可见光、紫外线、X 射线和伽马射线。
| Region/区域 | Wavelength/波长 | Dangers & Uses/危害与应用 |
|---|---|---|
| Radio | >0.1 m | Communications, broadcasting |
| Microwaves | 0.1 m – 1 mm | Cooking, satellite signals; can cause internal heating |
| Infrared | 1 mm – 700 nm | Thermal imaging, remote controls; skin burns |
| Visible light | 700 – 400 nm | Seeing, photography |
| Ultraviolet | 400 – 10 nm | Sunbeds, security marking; skin cancer, eye damage |
| X-rays | 10 – 0.01 nm | Medical imaging, airport security; damaging to cells |
| Gamma rays | <0.01 nm | Cancer treatment, sterilisation; highly ionising |
Higher frequency electromagnetic waves carry more energy and are more ionising, which means they can damage living cells. This is why exposure to UV, X-rays, and gamma rays must be strictly controlled.
更高频率的电磁波携带更多的能量，电离能力更强，这意味着它们可能损伤活细胞。因此，接触紫外线、X 射线和伽马射线必须严格控制。
10. Electric Circuits: Current, Voltage, and Resistance | 电路：电流、电压与电阻
Electric current is the rate of flow of charge. It is measured in amperes (A). The charge, current and time are linked by:
电流是电荷流动的速率，以安培（A）为单位。电荷、电流和时间的关系为：
Q = I × t
where Q is charge (coulombs, C), I is current (A), and t is time (s). Voltage (potential difference, V) measures the energy transferred per unit charge. Resistance (R) opposes the flow of current; it is measured in ohms (Ω).
其中 Q 是电荷（库仑，C），I 是电流（A），t 是时间（s）。电压（电势差，V）衡量单位电荷转移的能量。电阻（R）阻碍电流的流动，以欧姆（Ω）为单位。
Ohm's Law links these three quantities:
欧姆定律将这三个量联系起来：
V = I × R
In a series circuit, the current is the same everywhere, and the total resistance is the sum of individual resistances. In a parallel circuit, the voltage across each branch is the same, and the total current is the sum of the branch currents.
在串联电路中，各处电流相同，总电阻为各分电阻之和。在并联电路中，各支路两端电压相同，总电流为各支路电流之和。
You should be confident using circuit symbols for a cell, battery, switch, lamp, resistor, variable resistor, ammeter, voltmeter, diode, LDR, thermistor, and fuse. An ammeter is always connected in series, and a voltmeter in parallel.
你应该能熟练使用电池、开关、灯泡、电阻、可变电阻、电流表、电压表、二极管、光敏电阻（LDR）、热敏电阻和保险丝的电路符号。电流表必须串联连接，电压表必须并联连接。
11. Atomic Structure and Radioactivity | 原子结构与放射性
All matter is made of atoms, which consist of a nucleus containing protons and neutrons, orbited by electrons. The proton number (atomic number) defines the element, and the total of protons and neutrons gives the mass number. Isotopes are atoms of the same element with different numbers of neutrons.
所有物质都由原子组成。原子包含一个由质子和中子组成的原子核，电子绕核运动。质子数（原子序数）定义了元素，质子与中子的总和即为质量数。同位素是同一种元素中质子数相同但中子数不同的原子。
Some nuclei are unstable and emit radiation to become more stable. The three main types of nuclear radiation are alpha (α) particles, beta (β) particles, and gamma (γ) rays. Alpha particles are highly ionising but have a short range and are stopped by paper. Beta particles are moderately ionising, penetrate further, and are stopped by a few mm of aluminium. Gamma rays are weakly ionising, very penetrating, and require thick lead to reduce them.
某些原子核不稳定，会发出辐射以变得更为稳定。三种主要的核辐射是 α 粒子、β 粒子和 γ 射线。α 粒子电离能力很强，但射程短，能被纸张挡住。β 粒子电离能力中等，穿透力较强，能被几毫米的铝片挡住。γ 射线电离能力弱，穿透力极强，需要厚铅板才能减弱。
You must understand the changes in atomic and mass numbers during decay. Alpha decay reduces the mass number by 4 and the atomic number by 2. Beta decay increases the atomic number by 1 with no change in mass number. Gamma emission involves no change in these numbers.
你必须理解衰变过程中原子序数和质量数的变化。α 衰变使质量数减少 4，原子序数减少 2。β 衰变使原子序数增加 1，质量数不变。γ 辐射不改变这些数字。
12. Half-Life and Decay Curves | 半衰期与衰变曲线
The half-life of a radioactive isotope is the time taken for half of the unstable nuclei in a sample to decay, or the time for the count rate to fall to half its original value. This concept is used to predict how long a source remains active and is essential in medical treatments and radioactive dating.
放射性同位素的半衰期是指样本中半数不稳定的原子核发生衰变所经历的时间，或计数率下降到原来一半所需的时间。这一概念用于预测放射源能保持活性的时间，在医疗和放射性测年方面至关重要。
Half-life can be found from a decay graph by reading the time at which the count rate drops to half. The process is repetitive, so after two half-lives the activity falls to one-quarter of the original. Mathematically, you are not required to use exponential equations at Year 10, but you need to be able to determine half-life from a given curve or table.
半衰期可以从衰变曲线图中读出计数率下降到一半所需的时间。这一过程不断重复，因此经过两个半衰期后，活度下降到原来的四分之一。Year 10 不要求使用指数方程，但你需要能从给定的曲线或数据表中求出半衰期。
Background radiation comes from natural sources such as cosmic rays, rocks, and radon gas. In an experiment to find half-life, you must subtract the background count from all readings to obtain the corrected count rate from the source alone.
背景辐射来源于宇宙射线、岩石和氡气等天然源。在测定半衰期的实验中，必须从所有读数中减去背景辐射计数，才能得到仅由放射源产生的修正计数率。
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