📚 Year 12 Edexcel Physics: Rapid Vocabulary Memorisation Guide | Year 12 Edexcel 物理：词汇术语速记指南
Mastering the language of physics is the first step towards exam success. This guide breaks down the essential vocabulary from the Edexcel Year 12 specification into bite-sized definitions, paired with memory hooks and real-context usage. Whether you are reviewing mechanics, electricity, materials, or wave-particle duality, learning the terminology accurately will help you decode exam questions and write confident, precise answers.
掌握物理学的语言是通向考试成功的第一步。本指南将爱德思 Year 12 大纲中的核心词汇分解为精简短小的定义，并配以记忆线索和真实语境用法。无论你正在复习力学、电路、材料还是波粒二象性，准确学习术语都能帮助你破解考题、写出自信且精准的答案。
1. Essential Scientific Vocabulary & Measurement Errors | 基本科学词汇与测量误差
Accuracy describes how close a measured result is to the true value. A highly accurate experiment yields data that cluster around the accepted standard.
准确度描述测量结果与真实值的接近程度。高准确度的实验所产生的数据会聚集在公认的标准值附近。
Precision reflects the spread of repeated measurements — the smaller the scatter, the higher the precision, regardless of any systematic offset.
精密度反映重复测量结果之间的离散程度：离散越小，精密度越高，这与是否存在系统偏差无关。
Systematic error shifts every reading in the same direction, often caused by a wrongly zeroed instrument. It affects accuracy but not necessarily precision.
系统误差使所有读数朝同一方向偏移，通常由仪器未正确归零引起。它影响准确度，但未必影响精密度。
Random error scatters readings unpredictably and can be reduced by averaging many trials. It limits precision.
随机误差使读数不可预测地波动，可通过多次实验取平均值来减小。它主要限制精密度。
a single measurement, the absolute uncertainty is often half the smallest scale division.
不确定度表示真值很可能所在的一个区间，用 ± 某数值表示。对于单次测量，绝对不确定度通常为最小刻度值的一半。
Percentage uncertainty = (absolute uncertainty / measured value) × 100%. This quantity reveals the relative significance of the error.
百分不确定度 = (绝对不确定度 / 测量值) × 100%。该量反映了误差的相对重要程度。
2. Mechanics: Displacement, Velocity & Acceleration | 力学：位移、速度与加速度
Displacement is the vector counterpart of distance. It is the shortest straight line from start to finish, complete with a direction.
位移是距离的矢量版本，定义为从起点到终点的最短线段，并带有方向。
acement. Average velocity = total displacement ÷ time taken. Its sign indicates direction.
速度是位移的变化率。平均速度 = 总位移 ÷ 所用时间。其正负号代表方向。
Acceleration is the rate of change of velocity. In a straight line it can be found from the gradient of a velocity–time graph.
加速度是速度的变化率。在直线运动中，它等于速度–时间图线的斜率。
v = u + at
v = u + at
The SUVAT equations apply only when acceleration is constant. Vector quantities such as displacement, velocity and acceleration must be treated with their signs in one-dimensional problems.
SUVAT 方程仅在加速度恒定时适用。在求解一维问题时，位移、速度和加速度等矢量必须连同符号一起处理。
Free fall is a special case where a = g ≈ 9.81 m s⁻² downward. The word ‘free’ means the only force acting is gravity.
自由落体是加速度 a = g ≈ 9.81 m s⁻² 朝下的特殊情况。“自由”意味着唯一作用的力是重力。
3. Newton’s Laws & Momentum | 牛顿定律与动量
Newton’s First Law states that an object remains at rest or in uniform motion unless acted upon by a resultant force. Inertia is the natural resistance to changes in velocity.
牛顿第一定律指出，除非受到合力作用，否则物体将保持静止或匀速直线运动状态。惯性是物体对速度变化的天然抵抗。
× acceleration, or F = ma. It can also be written in terms of rate of change of momentum.
牛顿第二定律定量描述了关系：合力 = 质量 × 加速度，即 F = ma。它也可以用动量变化率的形式表达。
F = Δp/Δt
F = Δp/Δt
Newton’s Third Law reminds us that if body A exerts a force on body B, then B exerts an equal but opposite force on A. The two forces act on different bodies and are of the same type.
牛顿第三定律提醒我们，若物体 A 对物体 B 施加一个力，则 B 同时会对 A 施加一个大小相等、方向相反的力。这两个力作用在不同物体上，且属于同一种作用类型。
system with no external forces, total momentum is conserved. This principle is the cornerstone of collision and explosion calculations.
动量 p = mv 是矢量。在一个无外力的封闭系统中，总动量守恒。这一原理是碰撞与爆炸计算的基础。
Impulse is the change in momentum; it equals the area under a force–time graph. The word ‘impulse’ helps you remember that a force applied for a longer time produces a greater change in momentum.
冲量等于动量的变化量，也等于力–时间图线下的面积。“冲量”这个词帮助你记住：力作用的时间越长，动量的变化越大。
4. Work, Energy & Power | 功、能与功率
ection of the force: W = F × s cos θ, where θ is the angle between force and displacement.
功是力在其作用方向上移动距离时所完成的量：W = F × s cosθ，其中 θ 为力与位移之间的夹角。
nds on mass and the square of speed, which means doubling the speed quadruples the energy.
动能 Eₖ = ½ mv²。它取决于质量和速度的平方，意味着速度加倍会使动能变为原来的四倍。
surface. The zero level can be chosen for convenience; only changes have physical meaning.
在地表附近，重力势能的变化 ΔEₚ = mgΔh。零势能面可方便地任意选取，只有势能变化量才具有物理意义。
The principle of conservation of energy states that energy cannot be created or destroyed, only transferred between stores. It is the most powerful accounting tool in physics.
能量守恒原理指出，能量不能凭空产生或消失，只能在不同的能量存储形式之间转移。它是物理学中最强大的核算工具。
ring energy: P = W/t = Fv for an object moving at constant speed against a constant force.
功率是做功或转移能量的速率：P = W/t = Fv（适用于物体在恒力作用下匀速运动的情况）。
Efficiency = (useful energy output / total energy input) × 100%. No real device can exceed 100% efficiency.
效率 = (有用能量输出 / 总能量输入) × 100%。任何真实装置的效率都不会超过 100%。
5. Materials: Stress, Strain & Young Modulus | 材料：应力、应变与杨氏模量
sectional area within a material: σ = F/A. It has the same units as pressure, pascal (Pa).
应力 σ 是材料内部单位横截面积上承受的力：σ = F/A。其单位与压强相同，为帕斯卡 (Pa)。
ension: ε = ΔL/L₀, where L₀ is the original length. It has no units because it is a ratio.
应变 ε 是材料的相对伸长量：ε = ΔL/L₀，其中 L₀ 为原长。它没有单位，是一个比值。
ial stiffness: E = σ/ε, valid in the limit of Hookean (linear) behaviour. A steeper stress–strain line means a larger E.
杨氏模量 E 用于量化材料的刚度：E = σ/ε，适用于线弹性（胡克）行为范围。应力–应变图线越陡，E 越大。
Elastic limit is the stress beyond which the material no longer returns to its original shape. Plastic deformation involves permanent rearrangement of atoms.
弹性极限是指材料不再恢复原状的临界应力。塑性变形涉及原子发生永久性重排。
, where k is the spring constant. The stored elastic strain energy is area under the force–extension graph.
用于弹簧的胡克定律：F = kΔx，其中 k 为劲度系数。储存在弹簧中的弹性应变能等于力–伸长量图线下的面积。
Brittle materials break suddenly with little plastic strain; ductile materials show noticeable plastic flow and necking before fracture.
脆性材料在极小的塑性应变下突然断裂；延性材料则在断裂前表现出明显的塑性流变和颈缩。
6. Electric Current, Resistance & Circuits | 电流、电阻与电路
, it is the drift of free electrons; conventional current flows from positive to negative.
电流 I 是电荷流动的速率：I = ΔQ/Δt。在金属中，电流由自由电子的漂移形成；而约定电流方向是从正极流向负极。
.d.) V is the energy transferred per unit charge: V = W/Q. The volt is joules per coulomb.
电势差 V 是单位电荷转移的能量：V = W/Q。伏特即为焦耳每库仑。
istance R = V/I. An ohmic conductor has constant resistance at constant temperature; its I–V graph is a straight line through the origin.
电阻 R = V/I。欧姆导体在恒温下电阻恒定，其 I–V 图线是一条过原点的直线。
The factor L/A lets you compare the resistance of wires of different sizes geometrically.
电阻率 ρ 是材料的固有属性：R = ρL/A。通过几何因子 L/A，可以比较不同尺寸导线的电阻。
ts: P = IV = I²R = V²/R. Choosing the right form simplifies problem-solving significantly.
电路中的能量与功率：P = IV = I²R = V²/R。选用恰当的公式形式能极大简化求解过程。
tion = sum leaving. Kirchhoff’s voltage law: sum of e.m.f.s in a loop = sum of p.d. drops.
基尔霍夫电流定律：流入节点的电流之和等于流出电流之和。基尔霍夫电压定律：沿回路所有电动势之和等于所有电势降落之和。
7. Potential Dividers & Internal Resistance | 分压器与内阻
A potential divider uses two resistors in series to supply a fraction of the input voltage: Vout = R₂/(R₁+R₂) × Vin. It appears in sensor circuits, volume controls and many EMQ contexts.
分压器利用两个串联电阻提供输入电压的一部分：Vout = R₂/(R₁+R₂) × Vin。它广泛应用于传感器电路、音量控制和许多电磁学考题中。
Vout = (R₂ / (R₁ + R₂)) × Vin
Vout = (R₂ / (R₁ + R₂)) × Vin
If a variable resistor or thermistor forms one arm, Vout changes with temperature or light, converting a physical change into a voltage signal.
若分压器的一臂是可变电阻或热敏电阻，Vout 会随温度或光照改变，从而将物理变化转换为电压信号。
r. Terminal p.d. V = ε − Ir, where ε is the electromotive force (e.m.f.). Lost volts = Ir.
真实电源具有内阻 r。端电压 V = ε − Ir，其中 ε 为电动势。损失的电压 = Ir。
E.m.f. is the energy transferred into electrical form per unit charge by the source. It is measured in volts when no current flows, or determined from the intercept of a V–I graph.
电动势是电源将单位电荷转变为电能时所提供的能量。可在无电流时测量，或通过 V–I 图线的截距求得。
8. Waves: Amplitude, Frequency & Phase | 波：振幅、频率与相位
Amplitude A is the maximum displacement from rest position. In a transverse wave, it is the height of a crest; in sound, it relates to loudness.
振幅 A 是质点离开平衡位置的最大位移。在横波中，它是波峰的高度；在声波中，它与响度相关。
lations per second, measured in hertz (Hz). Period T = 1/f is the time for one full cycle.
频率 f 是每秒完成的完整振动次数，单位为赫兹 (Hz)。周期 T = 1/f，即为完成一次全振动所需的时间。
h λ is the distance between two adjacent points that are in phase, such as crest to crest.
波速 v = fλ。波长 λ 是两相邻同相点之间的距离，例如波峰到波峰。
v = fλ
v = fλ
Phase difference tells you how much one oscillation is ‘shifted’ relative to another. A half-cycle difference is π rad (180°) and yields complete cancellation in superposition.
相位差表示一个振动相对于另一个振动的“偏移”程度。半周期相位差为 π rad (180°)，在叠加时会产生完全抵消。
Transverse waves oscillate perpendicular to energy transfer (e.g. ripple on a string); longitudinal waves oscillate parallel (e.g. sound). Polarisation is only possible for transverse waves.
横波的振动方向垂直于能量传递方向（如绳波）；纵波的振动方向与之平行（如声波）。偏振只能发生在横波中。
Coherence means waves have the same frequency and a constant phase difference. It is a necessary condition for stable interference patterns.
相干性指波具有相同频率且保持恒定的相位差。这是产生稳定干涉图样的必要条件。
9. Superposition, Interference & Standing Waves | 叠加、干涉与驻波
The principle of superposition states that when two waves meet, the resultant displacement is the vector sum of their individual displacements. It works for all wave types.
叠加原理指出，当两列波相遇时，合位移等于各列波位移的矢量和。这一原理适用于所有类型的波。
Constructive interference occurs where waves arrive in phase, giving a larger amplitude. Destructive interference occurs when they arrive out of phase, reducing the amplitude.
当波以相同相位相遇时发生相长干涉，振幅增大；以反相相遇时发生相消干涉，振幅减小。
ble-slit interference with light of wavelength λ, fringe spacing w = λD/s, where D is slit–reen distance and s is slit separation. The formula reveals the tiny scale of light waves.
对于波长为 λ 的光的双缝干涉，条纹间距 w = λD/s，其中 D 为缝到屏幕的距离，s 为缝间距。该公式揭示了光波的极小尺度。
w = λD / s
w = λD / s
sin θ = nλ. Since multiple slits are involved, the bright lines are narrower and brighter.
衍射光栅在满足 d sinθ = nλ 的角度产生尖锐的极大值。由于涉及多条狭缝，亮纹更窄且更亮。
Stationary (standing) waves store energy between fixed nodes. They form by superposition of two identical progressive waves travelling in opposite directions. Nodes are points of zero displacement; antinodes have maximum amplitude.
驻波通过两个相同但反向行进的波的叠加形成，在节点之间储存能量。节点是位移始终为零的位置；波腹的振幅最大。
The fundamental frequency of a stretched string is f = (1/2L) √T/μ, where T is tension and μ is mass per unit length. Only discrete harmonics are possible.
张紧弦的基频为 f = (1/2L) √T/μ，其中 T 为张力，μ 为线密度。只有离散的谐频能够存在。
10. Photoelectric Effect & Particle Nature of Light | 光电效应与光的粒子性
The photoelectric effect is the emission of electrons from a metal surface when illuminated by light of sufficiently high frequency. The effect is instantaneous and cannot be explained by classical wave theory.
光电效应是指用频率足够高的光照射金属表面时，金属向外发射电子的现象。这种效应是瞬时的，无法用经典波动理论解释。
where h is the Planck constant. A photon delivers all its energy in a single interaction.
光子是无质量的电磁能包：E = hf，其中 h 为普朗克常量。一个光子在单次相互作用中交出全部能量。
E = hf = hc/λ
E = hf = hc/λ
The work function φ is the minimum energy needed to eject an electron. The kinetic energy of the emitted electron is given by Einstein’s photoelectric equation: KEmax = hf − φ.
逸出功 φ 是使电子逸出所需的最小能量。发射电子的最大动能由爱因斯坦光电方程给出：KEmax = hf − φ。
KEmax = hf − φ
KEmax = hf − φ
₀ no electrons are emitted, no matter how intense the beam. This is the crucial evidence for quantisation.
截止频率 f₀ = φ/h。若频率低于 f₀，无论光束有多强都不会发射电子。这是量子化的关键证据。
The stopping potential Vs relates to KEmax: eVs = KEmax. A graph of Vs against f yields a line whose gradient is h/e and intercept gives the work function.
遏止电势 Vs 与最大动能的关系：eVs = KEmax。Vs 对 f 的图线是一条直线，其斜率为 h/e，截距可求得逸出功。
= h/p. Electron diffraction experiments confirm that matter exhibits wave-like behaviour.
德布罗意假说赋予任何运动的粒子一个波长：λ = h/p。电子衍射实验证实了物质具有波动性。
11. Memory Tips & Exam Advice | 记忆技巧与考试建议
Create flashcards with the term on one side and the definition, equation and a vivid diagram on the other. Active recall, not passive rereading, builds long-term retention.
制作抽认卡，正面写术语，背面写定义、公式和生动的示意图。主动回忆而非被动重读，才能建立长期记忆。
Use mnemonics for sequences: ‘SUVAT’ reminds you of the five kinematics quantities; ‘V = I R’ pictorially shows Ohm’s law as a triangle. Turn abstract symbols into stories.
使用助记符来记忆顺序：‘SUVAT’提醒你五个运动学量；‘V = I R’可以用三角图直观表示欧姆定律。把抽象符号变成故事。
For definitions that differ by one word, such as ‘accuracy’ versus ‘precision’, draw a target diagram. The visual contrast helps your brain separate the concepts quickly.
对于仅一字之差的定义，例如‘准确度’与‘精密度’，画一个靶心图。视觉对比能帮助大脑快速区分概念。
When revising formulas, speak them aloud and write them while explaining the meaning of each symbol. Multisensory input strengthens neural pathways.
复习公式时，大声说出来并边写边解释每个符号的含义。多感官输入能强化神经通路。
On exam day, underline command words in questions and define all technical terms you use in your answers. Examiners reward precise language — ‘velocity’ is a vector; ‘speed’ is scalar.
考试当天，在题目中划出指令词，并在答案中为你使用的所有技术术语下定义。考官会奖励精确的语言——‘速度’是矢量，‘速率’是标量。
Avoid vague phrases such as ‘the wire resists’. Instead write ‘the moving electrons collide with lattice ions, transferring energy to the metal and raising its internal energy’. Vocabulary precision demonstrates depth.
避免含糊的表述，如‘导线在抗拒’。而应写‘移动的电子与晶格离子碰撞，将能量传递给金属并使其内能升高’。词汇的精确能展示你的理解深度。
Finally, practise past paper questions under timed conditions while deliberately using the vocabulary you have learned. Retrieving the correct term in context cements both knowledge and confidence.
最后，在限时条件下练习往年真题，并刻意运用所学的词汇。在语境中检索正确术语能够同时巩固知识并建立信心。
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