📚 Year 9 CAIE Physics: Vocabulary & Terminology Quick-Memorization Guide | Year 9 CAIE 物理：词汇术语速记指南
Mastering the language of physics is half the battle. In Year 9, CAIE students face a flood of new terms from forces to electricity – and memorising them can feel overwhelming. This guide pairs every key term with a simple memory hack, acronym, or visual, so you can lock definitions in quickly and recall them confidently under exam pressure.
掌握物理的语言是成功的一半。九年级的 CAIE 学生需要面对从力到电学的大量新术语，记忆这些词常让人头疼。本指南为每个关键术语配上一个简单的记忆方法、首字母缩略词或图像，让你能快速记住定义，在考试中自信回忆。
1. Kinematics Terms | 运动学术语速记
Scalar – a quantity with only magnitude. Think ‘scalar = scale’, like the number on a weighing scale.
标量 – 只有大小的物理量。联想“标量”即“只有标度的量”，像体重秤上的数字。
Vector – has both magnitude and direction. Picture an arrow: it points somewhere and has a length.
矢量 – 既有大小又有方向。想象一支箭：它指向某个方向并且有长度。
Speed – how fast something moves; scalar. Say aloud: ‘Speed is simple – just a number.’
速率 – 物体移动的快慢；标量。念出来：“速率很简单——只是一个数字。”
Velocity – speed in a given direction; vector. Link the ‘v’ in velocity and vector – both need direction.
速度 – 带有方向的速率；矢量。把 velocity 和 vector 的 “v” 联系起来——两者都需要方向。
Acceleration – rate of change of velocity. Imagine pressing a car’s accelerator – speed changes. Formula: a = Δv / t
加速度 – 速度的变化率。想象踩下汽车油门 (accelerator) —— 速度改变。公式：a = Δv / t
Deceleration – negative acceleration (slowing down). Think ‘de-‘ as down, speed goes down.
减速度 – 负加速度（减速）。记法：“减 (de-)”表示下降，速度下降。
2. Forces and Newton’s Laws | 力与牛顿定律术语
Force – a push or pull, measured in newtons (N). Recall: ‘A force can start or stop motion.’
力 – 一个推或拉的作用，单位是牛顿 (N)。记住：“力能让物体运动或停止。”
Mass – amount of matter in an object, in kilograms. Mnemonic: ‘Mass stays the same everywhere – it’s the stuff.’
质量 – 物体所含物质的多少，单位千克。口诀：“质量是物质的量，在哪里都不变。”
Weight – force due to gravity, W = mg. On the Moon your weight changes, but your mass is constant.
重量 – 由于重力产生的力，W = mg。在月球上重量会变小，但质量不变。
Gravitational field strength (g) – 9.8 N/kg on Earth. Remember ‘g’ is the weight per kilogram.
重力场强度 (g) – 地球上约为 9.8 N/kg。理解为每千克物质承受的重力。
Resultant force – the overall force acting. If forces are balanced, resultant = 0. Visual: tug-of-war; if both pull equally, ribbon doesn’t move.
合力 – 作用在物体上的总力。如果力平衡，合力为 0。想象拔河：两边用力相等，红绸不动。
Friction – force that opposes motion between surfaces. Cue: ‘Friction creates heat – rub your hands.’
摩擦力 – 阻碍接触表面相对运动的力。提示：“摩擦生热——搓搓手感受一下。”
Hooke’s Law – extension is proportional to force, up to the limit of proportionality. Formula: F = kx. Think of a spring stretching steadily.
胡克定律 – 在弹性限度内，伸长量与力成正比。公式：F = kx。想象一根弹簧均匀伸长。
Terminal velocity – constant speed when drag equals weight. Memory: ‘terminal’ means final – it stops accelerating.
终极速度 – 当阻力等于重力时物体达到的恒定速度。记法：“终极”意味着最终——不再加速。
3. Pressure, Density and Moments | 压强、密度与力矩
Density – mass per unit volume: ρ = m / V. Compare: a rock is dense, a sponge is not. Imagine the particles packed tightly.
密度 – 单位体积的质量：ρ = m / V。对比：岩石致密，海绵疏松。想象粒子紧紧挤在一起。
Pressure – force per unit area: P = F / A. A sharp knife exerts high pressure because area is tiny. Link: ‘pin = high pressure’.
压强 – 单位面积上的力：P = F / A。刀刃锋利，接触面积小，压强大。联想：“针尖 = 高压强”。
Atmospheric pressure – pressure from the weight of air above us. Remember we live at the bottom of an ocean of air.
大气压强 – 由上方空气柱重量产生的压强。记住我们生活在“空气海洋”的底部。
Moment – turning effect of a force: Moment = Force × perpendicular distance from pivot. A door handle is placed far from hinges to increase the moment – that’s why it’s easier to open.
力矩 – 力的转动效果：力矩 = 力 × 到支点的垂直距离。门把手安得离铰链远些以增大力矩——因此开门更省力。
Centre of mass – the point where the mass seems to be concentrated. Balance a ruler on your finger – that point is exactly its centre of mass.
质心 – 质量似乎集中的那个点。用手指平衡一把尺子，支撑点正是质心。
4. Energy, Work and Power | 能量、功和功率
Energy – the ability to do work, measured in joules (J). Mnemonic: ‘Energy is never used up, only transferred.’
能量 – 做功的能力，单位焦耳 (J)。记忆口诀：“能量不会消灭，只会转移。”
Kinetic energy (KE) – energy of motion. Formula: KE = ½ m v². If you double the speed, KE quadruples – think of a car crash at high speed.
动能 (KE) – 运动的能量。公式：KE = ½ m v²。速度变为两倍，动能增至四倍——想想高速车祸。
Gravitational potential energy (GPE) – energy stored due to height: GPE = m g h. The higher an object, the more GPE it stores.
重力势能 (GPE) – 因高度而储存的能量：GPE = m g h。物体越高，储存的重力势能越多。
Work done – energy transferred when a force moves an object: W = F d. Remember ‘work is force through a distance’.
做功 – 当力使物体移动时转移的能量：W = F d。记得“做功就是力乘以沿力方向移动的距离”。
Power – rate of doing work: P = W / t. A powerful engine does the same work in less time. The unit is watt (W).
功率 – 做功的快慢：P = W / t。功率大的发动机能用更短的时间做同样的功。单位是瓦特 (W)。
Efficiency – useful energy output divided by total energy input × 100%. No device is 100% efficient – some energy always turns into heat.
效率 – 有用能量输出占总能量输入的百分比。没有设备能达到 100% 效率——总有一部分能量变成热。
5. Waves Terminology | 波术语速记
Transverse wave – oscillations are perpendicular to the direction of energy transfer, like light or water ripples. Think ‘Transverse = Across’, just as the letter T crosses.
横波 – 振动方向与能量传播方向垂直，例如光波或水波。联想：“横”波即振动横向跨越传播方向，T 字母也是交叉的。
Longitudinal wave – oscillations are parallel to energy transfer, like sound. Mnemonic: ‘Long’itudinal waves move along the same line – imagine pushing and pulling a slinky.
纵波 – 振动方向与能量传递方向平行，如声波。记法：“纵”波沿着同一条线振动——像推拉弹簧玩具。
Amplitude – maximum displacement from the rest position. Loud sound = large amplitude. Visual: the height of a sea wave.
振幅 – 离开平衡位置的最大位移。响度大的声音振幅大。形象记忆：海浪的高度。
Wavelength (λ) – distance between two consecutive crests or compressions. Symbol λ looks like a stretched wave.
波长 (λ) – 相邻两个波峰或密部之间的距离。符号 λ 像一个拉长了的波浪。
Frequency (f) – number of waves passing a point per second, in hertz (Hz). High frequency = high pitch. Memorise: f = 1/T.
频率 (f) – 每秒通过某点的波数，单位赫兹 (Hz)。频率高则音调高。记住：f = 1/T。
Wave speed (v) – how fast the wave travels: v = f λ. Dictum: ‘Velocity equals frequency times wavelength – the VFW formula.’
波速 (v) – 波传播的快慢：v = f λ。口诀：“波速等于频率乘波长，VFW。”
6. Thermal Physics and Heat Transfer | 热物理与热传递
Conduction – heat transfer through solids, mainly by vibrating particles passing energy along. Imagine a line of dominoes toppling – energy moves without the material itself moving.
热传导 – 热量通过固体传递，主要靠振动的粒子依次传递能量。想象一排多米诺骨牌倒下——能量移动而物质本身不流动。
Convection – heat transfer in fluids (liquids and gases) by the movement of the fluid itself. Cue: ‘Hot fluid rises, cold sinks – it creates a convection current.’ Pot of boiling water shows this clearly.
对流 – 流体（液体和气体）中因流体自身流动而传递热量。提示：“热流体上升，冷流体下沉——形成对流环流。” 沸水锅中的翻滚就是最佳例子。
Radiation – heat transfer by infrared electromagnetic waves; can travel through a vacuum. Remember the Sun’s heat reaching Earth through empty space.
热辐射 – 通过红外电磁波传热；可以在真空中传播。记住太阳的热量穿过真空到达地球。
Insulator – a material that reduces heat transfer. Air trapped in wool acts as an excellent insulator. Say: ‘Insulators keep the heat in.’
绝热体/保温材料 – 减缓热传递的材料。羊毛中困住的空气是优良的绝热体。记住：“绝热体留住热量。”
Conductor (thermal) – a material that allows heat to flow easily, like metals. Lesson: ‘Metals have free electrons that speed up conduction.’
热导体 – 允许热量快速流动的材料，如金属。解释：“金属中有大量自由电子能加速热传导。”
7. Electricity Essentials | 电学基础术语
Current (I) – the rate of flow of electric charge, measured in amperes (A). Flow of electrons is opposite to conventional current. Imagine water flowing through a pipe – current tells you how much water passes per second.
电流 (I) – 电荷流动的速率，单位安培 (A)。电子流动方向与电流方向相反。想象水流过水管——电流告诉你每秒流过多少“电荷水”。
Voltage (V) – the energy per unit charge, also called potential difference. It ‘pushes’ current around a circuit. Compare: voltage is like the height of a water slide – higher slide gives more push.
电压 (V) – 单位电荷的能量，也称电势差。它“推动”电荷在回路中流动。类比：电压就像水滑梯的高度——越高推动力越大。
Resistance (R) – opposition to current, in ohms (Ω). A thin wire has more resistance. Memory aid: ‘Resistance restricts the flow.’
电阻 (R) – 对电流的阻碍作用，单位欧姆 (Ω)。细导线电阻更大。记忆口诀：“电阻限流。”
Ohm’s Law – V = I R for an ohmic conductor at constant temperature. Mnemonic: “Very Important Rule” or “Victoria Is Queen”.
欧姆定律 – 恒温下对欧姆导体，V = I R。记忆法：“Very Important Rule” 或“维多利亚是女王” (V=I×R)。
Series circuit – components connected end-to-end; current is the same everywhere, but voltage divides. Cheat: ‘Series = single path.’
串联电路 – 元件首尾相连；各处电流相同，但电压分配。速记：“串联 = 一条路径。”
Parallel circuit – components on separate branches; voltage is the same across each branch, but current divides. Visual: train tracks that diverge.
并联电路 – 元件在不同支路；各支路电压相同，但电流分流。想象分叉的铁轨。
8. Magnetism and Electromagnetism | 磁与电磁术语
Magnetic field – region around a magnet where a magnetic force is felt. Lines go from north to south. Think of invisible arrows sprouting from the north pole.
磁场 – 磁体周围感受磁力的区域。磁感线从北极指向南极。想象从北极长出的隐形箭头。
Electromagnet – a coil of wire (solenoid) that becomes magnetic when current flows. The strength increases with more turns or higher current. Recall: ‘Electro-magnet = electricity creates magnet.’
电磁铁 – 通电时产生磁性的线圈（螺线管）。增加匝数或增大电流可增强磁性。记住：“电磁铁 = 电生磁。”
Permanent magnet – always magnetic, like a bar magnet. It won’t switch off. Contrast with electromagnet.
永久磁铁 – 始终有磁性的磁体，如条形磁铁。它不能关闭。与电磁铁对比记忆。
Motor effect – a force on a current-carrying wire in a magnetic field. F = B I L. Use Fleming’s left-hand rule: thumb = Force, First finger = Field, seCond finger = Current.
电动机效应 – 通电导线在磁场中受力。可用弗莱明左手定则：拇指 = 力 (Force)，食指 = 磁场 (Field)，中指 = 电流 (Current)。
9. Commonly Confused Terms & General Memory Hacks | 易混淆术语与通用记忆技巧
Mass vs. Weight: Mass is the amount of stuff (kg), weight is the gravitational force (N). On the Moon mass is the same but weight is 1/6. Mantra: ‘Mass is constant; weight depends on g.’
质量 与 重量：质量是物质的量 (kg)，重量是重力 (N)。在月球上质量不变但重量只有地球的 1/6。口诀：“质量永恒，重量随 g 变。”
Speed vs. Velocity: Speed has no direction (scalar), velocity has direction (vector). Around a circular track, your speed might be steady but velocity constantly changes direction.
速率 与 速度：速率无方向（标量），速度有方向（矢量）。在圆形跑道上，速率可能恒定但速度方向一直在变。
Heat vs. Temperature
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