Year 12 CIE Physics: Quick Terminology Memorization Guide | Year 12 CIE 物理：词汇术语速记指南

📚 Year 12 CIE Physics: Quick Terminology Memorization Guide | Year 12 CIE 物理：词汇术语速记指南

Mastering physics vocabulary is essential for achieving high marks in your CIE AS Level Physics exams. Scientific terminology often appears intimidating, but with clever memory aids and logical grouping, you can quickly memorize and confidently apply these terms. This guide breaks down the key vocabulary from the Year 12 CIE syllabus into manageable sections, providing effective memorization strategies for each topic.

掌握物理词汇对于在CIE AS物理考试中取得高分至关重要。科学术语常常令人生畏，但借助巧妙的记忆技巧和逻辑分类，你可以快速记住并自信地应用这些术语。本指南将Year 12 CIE课程中的关键词汇分解成易于掌握的部分，为每个主题提供有效的速记策略。

1. Base Quantities, Units and Scalars/Vectors | 基本量、单位与标矢量

The seven SI base quantities form the absolute foundation. Use the mnemonic ‘MASS LENGTH TIME TEMP CURRENT AMOUNT LUMINOUS INTENSITY’ or the acronym ‘MILK CATS’ – Mass (kg), Length (m), Time (s), Current (A), Temperature (K), Amount of substance (mol), Luminous intensity (cd). Picture a carton of milk for cats to recall them instantly.

七个SI基本量构成了全部测量的基础。使用助记句“质量长度时间温度电流物质的量发光强度”或首字母缩写“MILK CATS”（牛奶猫咪）——质量(kg)、长度(m)、时间(s)、电流(A)、温度(K)、物质的量(mol)、发光强度(cd)。想象一盒给猫准备的牛奶，就能瞬间记起这七个基本量。

Base Quantity	Unit Name	Symbol
Mass	kilogram	kg
Length	metre	m
Time	second	s
Electric current	ampere	A
Temperature	kelvin	K
Amount of substance	mole	mol
Luminous intensity	candela	cd

Common prefixes are best remembered in descending order: Tera (T, 10¹²), Giga (G, 10⁹), Mega (M, 10⁶), kilo (k, 10³), deci (d, 10⁻¹), centi (c, 10⁻²), milli (m, 10⁻³), micro (µ, 10⁻⁶), nano (n, 10⁻⁹), pico (p, 10⁻¹²). Think ‘The Great Man King Henry Died By Drinking Chocolate Milk, Micro Nano Pico’ for the positive powers plus milli-micro-nano-pico.

常见词头按降序记忆：太(T,10¹²)、吉(G,10⁹)、兆(M,10⁶)、千(k,10³)、分(d,10⁻¹)、厘(c,10⁻²)、毫(m,10⁻³)、微(µ,10⁻⁶)、纳(n,10⁻⁹)、皮(p,10⁻¹²)。用“太急找（吉兆）千分厘米毫微纳皮”作为中文口诀，英文则可用“The Great Man King Henry Died By Drinking Chocolate Milk, Micro Nano Pico”。

A scalar has only magnitude (e.g. mass, speed, energy), while a vector has both magnitude and direction (e.g. displacement, velocity, force). To recall the difference, associate ‘scalar’ with ‘scale’ (just a number) and ‘vector’ with ‘arrow’ (direction matters).

标量仅有大小（如质量、速率、能量），矢量既有大小又有方向（如位移、速度、力）。为记住区别，将“scalar”联想为“scale”（仅仅是数字），而“vector”联想为“arrow”（箭头代表方向）。

2. Measurement and Errors | 测量与误差

Accuracy refers to how close a measured value is to the true value, while precision describes the spread or repeatability of measurements. Think of a dartboard: accurate hits are near the bullseye, precise hits are clustered together even if far from the centre.

准确度指测量值接近真值的程度，精密度描述测量值的离散程度或可重复性。想象飞镖靶盘：准确就是接近靶心，精密则是飞镖扎在一起哪怕远离靶心。

Systematic errors cause readings to be consistently too high or too low (e.g. a zero error on a metre rule). Random errors scatter readings about the mean and can be reduced by averaging. Memory trick: ‘Systematic’ sounds like ‘system’, indicating a faulty system; ‘Random’ means unpredictable fluctuations.

系统误差使读数总是偏大或偏小（如米尺的零点误差）。随机误差使读数分布在均值周围，可通过求平均来减小。记忆法：“Systematic”听上去像“system”，暗示系统有缺陷；“Random”则表示不可预测的起伏。

Absolute uncertainty is the ± value from an instrument, e.g. ±0.5 mm for a ruler. Percentage uncertainty = (absolute uncertainty / measured value) × 100%. This is vital for combining uncertainties.

绝对不确定度是仪器的±值，例如直尺的±0.5 mm。百分不确定度 = (绝对不确定度 / 测量值) × 100%。这在合成不确定度时至关重要。

3. Kinematics | 运动学

Displacement (vector) is the straight-line distance in a given direction from the starting point. Distance is a scalar that measures the total path length. Link ‘displacement’ to ‘moved place’ – it cares about where you end up relative to start.

位移（矢量）是从起点出发沿某一方向的直线距离。路程是标量，量度路径的总长度。将“displacement”联想为“换了位置”——它只关心终点相对于起点的位置。

Velocity is the rate of change of displacement: v = Δs / Δt. Speed is the rate of change of distance. Velocity and speed are almost twins but velocity demands direction. Use the SUVAT equations for constant acceleration:

速度是位移的变化率：v = Δs / Δt。速率是距离的变化率。速度和速率几乎是双胞胎，但速度要求方向。匀加速运动的SUVAT方程如下：

v = u + a t

s = u t + ½ a t²

v² = u² + 2 a s

s = ½ (u + v) t

Memorise these as ‘v=u+at’, ‘s equals u t plus half a t squared’, ‘v squared equals u squared plus 2 a s’ and ‘average velocity times time’. Every symbol must be a vector in one dimension; assign positive and negative directions.

记住这些公式：“v等于u加at”、“s等于ut加二分之一at方”、“v方等于u方加2as”、“平均速度乘时间”。在一维运动中每个物理量都要考虑正负方向。

Acceleration is the rate of change of velocity: a = Δv / Δt. Free fall near Earth has acceleration g = 9.81 m s⁻² downwards. The gradient of a displacement-time graph gives velocity; the gradient of a velocity-time graph gives acceleration; the area under a velocity-time graph gives displacement.

加速度是速度的变化率：a = Δv / Δt。地球附近的自由落体加速度g = 9.81 m s⁻²向下。位移-时间图的斜率给出速度；速度-时间图的斜率给出加速度；速度-时间图下的面积给出位移。

4. Dynamics | 动力学

Newton’s laws: First law (inertia) – An object remains at rest or uniform motion unless acted upon by a net external force. Second law – F = m a, net force equals rate of change of momentum. Third law – If body A exerts a force on body B, B exerts an equal and opposite force on A. Recall: ‘Inertia resists change’; ‘F=ma pushes’; ‘Action-reaction pairs’.

牛顿定律：第一定律（惯性）——物体保持静止或匀速直线运动除非受到净外力。 第二定律——F = m a，合外力等于动量变化率。 第三定律——若A对B施力，则B对A施加等大反向的力。记住：“惯性抵抗变化”；“F=ma推动”；“作用力与反作用力对”。

Momentum p = m v is a vector. Impulse is the change in momentum: Δp = F Δt. Think of impulse as a ‘force push over time’. The principle of conservation of momentum states total momentum before collision equals total momentum after, provided no external forces act.

动量 p = m v 是矢量。冲量是动量的变化：Δp = F Δt。将冲量想象为“力在时间上的推动”。动量守恒定律：只要没有外力作用，碰撞前的总动量等于碰撞后的总动量。

Mass is the measure of inertia (kg), whereas weight is the gravitational force on a mass: W = m g. Never confuse them – mass stays constant; weight changes with g.

质量是惯性大小的量度(kg)，而重量是作用在质量上的引力：W = m g。绝不要混淆——质量恒定；重量随g变化。

Friction opposes relative motion. Drag (air resistance) increases with speed. Tension is the pulling force in a string. Upthrust arises from pressure difference in a fluid. Memorise by linking: ‘friction fights’, ‘drag drags’, ‘tension tightens’.

摩擦力阻碍相对运动。拖曳力（空气阻力）随速度增大。张力是绳子中的拉力。浮力源于流体的压力差。这样记忆：“friction fights（摩擦打架）”，“drag drags（拖拽拖曳）”，“tension tightens（张力绷紧）”。

5. Work, Energy and Power | 功、能与功率

Work is done when a force moves its point of application: W = F d cosθ, where θ is the angle between force and displacement. Energy is the capacity to do work. The unit joule (J) is 1 N m. Tip: ‘work = force along distance’.

功是力使力的作用点移动的产物：W = F d cosθ，θ是力与位移的夹角。能量是做功的本领。单位焦耳(J)即1 N·m。口诀：“功等于力沿位移方向的分量乘位移”。

Kinetic energy K.E. = ½ m v² – energy due to motion. Gravitational potential energy GPE = m g h – energy due to height. Elastic potential energy EPE = ½ k x² for a spring obeying Hooke’s law. Notice the ‘half-something-square’ pattern.

动能 K.E. = ½ m v² ——由运动而生的能量。重力势能 GPE = m g h ——由高度而生的能量。弹性势能 EPE = ½ k x² （服从胡克定律的弹簧）。注意它们共有的“半某量平方”模式。

Power is the rate of doing work: P = W / t = F v for constant force and velocity. Average power vs instantaneous power. Efficiency = (useful output power) / (total input power) × 100%. Think ‘power = work per second’.

功率是做功的速率：P = W / t = F v （恒力和速度条件下）。区分平均功率和瞬时功率。效率 = （有用输出功率）/（总输入功率）× 100%。记成“功率等于每秒做功”。

6. Matter and Materials | 物质与材料

Density ρ = m / V describes how much mass is packed in a volume. Picture a sponge versus a brick. Pressure P = F / A for a solid; in a fluid P = h ρ g. The unit pascal (Pa) = 1 N m⁻².

密度ρ = m / V描述单位体积所含的质量。想象海绵和砖头。压强固体 P = F / A；流体中 P = h ρ g。单位帕斯卡(Pa) = 1 N m⁻²。

Hooke’s law: the extension x of a spring is proportional to the applied force F, i.e. F = k x, where k is the spring constant. The limit of proportionality marks where this linear relationship ends. Elastic limit is the point beyond which permanent deformation occurs.

胡克定律：弹簧的伸长量x与外力F成正比，即F = k x，k为劲度系数。比例极限标志着线性关系结束的位置。弹性极限是发生永久形变的分界点。

In material science, stress = F / A, strain = ΔL / L₀. Young modulus E = stress / strain, which measures stiffness. A mnemonic: ‘Stress causes strain, Young measures pain (stiffness)’. A steep stress-strain graph indicates a stiff material.

材料科学中，应力 = F / A，应变 = ΔL / L₀。杨氏模量 E = 应力/应变，衡量劲度。助记口诀：“Stress causes strain, Young measures pain（应力造成应变，杨氏量度痛苦即劲度）”。应力-应变图越陡，材料越刚硬。

7. Waves | 波

Transverse waves have particles vibrating perpendicular to energy transfer (e.g. light, water ripples). Longitudinal waves have particles vibrating parallel to energy transfer (e.g. sound). Visualise a rope flick for transverse, a slinky push-pull for longitudinal.

横波的质点振动方向与能量传递方向垂直（如光、水波）。纵波的质点振动方向与能量传递方向平行（如声音）。想象抖动绳子就是横波，推拉弹簧就是纵波。

Key terms: Amplitude (A) – maximum displacement from equilibrium. Wavelength (λ) – distance between consecutive identical points. Frequency (f) – number of oscillations per second, unit hertz (Hz). Period (T) = 1 / f. The wave equation: v = f λ. Phase difference is measured in radians or degrees.

关键术语：振幅(A)——离开平衡位置的最大位移。波长(λ)——相邻同相位点之间的距离。频率(f)——每秒振动次数，单位赫兹(Hz)。周期(T) = 1 / f。波动方程：v = f λ。相位差以弧度或度表示。

Intensity is the power per unit area and is proportional to amplitude squared (I ∝ A²). Polarisation proves a wave is transverse: it confines vibrations to one plane. Only transverse waves can be polarised. Think ‘polaroid sunglasses cut glare’ to recall.

强度是单位面积的功率，与振幅的平方成正比(I ∝ A²)。偏振证明波是横波：它将振动限制在一个平面内。只有横波才能偏振。联想“偏光太阳镜削减眩光”来记忆。

8. Superposition and Interference | 叠加与干涉

The principle of superposition states that when two waves meet, the resultant displacement is the algebraic sum of the individual displacements. Constructive interference occurs when waves arrive in phase, giving a larger amplitude. Destructive interference occurs when waves arrive in antiphase, canceling each other.

叠加原理指出，两列波相遇时，合位移等于各列波位移的代数和。相长干涉发生在波同相到达时，振幅增强。相消干涉发生在波反相到达时，彼此抵消。

For coherence, sources must maintain a constant phase difference and have the same frequency. The conditions for bright and dark fringes in Young’s double-slit experiment: constructive when

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Year 12 CIE Physics: Quick Terminology Memorization Guide | Year 12 CIE 物理：词汇术语速记指南