📚 Year 9 SQA Physics: Vocabulary Quick Memorisation Guide | SQA 物理九年级：词汇术语速记指南
Physics can feel like a brand-new language, packed with words that pop up in everyday life but carry a much sharper meaning in a scientific context. This guide is designed to help Year 9 students following the SQA curriculum lock in those essential terms quickly and effectively. By organising words into topic clusters, pairing English definitions with Chinese translations, and adding simple memory hooks, you will build the confidence to use physics vocabulary accurately in class discussions, homework and assessments.
物理有时像一门全新的语言，里面满是日常生活里会用、科学语境下含义却精准得多的词汇。这份指南专为学习 SQA 课程的九年级学生准备，帮助大家迅速、高效地牢记核心术语。我们按主题整理词条，为每条英文定义配上中文解释，再加上好记的小窍门，你就能在课堂讨论、作业和考试中自信地用对物理词汇。
1. Why Master Physics Vocabulary? | 为什么要掌握物理词汇？
Many physics questions test understanding through precise language. If you confuse ‘velocity’ with ‘speed’ or think ‘energy’ and ‘force’ are the same thing, marks slip away even when your calculation is correct. Building a strong vocabulary base also makes it easier to follow explanations, ask good questions and link ideas across different topics like mechanics, electricity and waves.
很多物理考题都是通过精准的语言来检验理解程度的。如果把“速度”和“速率”搞混，或者以为“能量”和“力”是一回事，那就算计算对了也会丢分。建立扎实的词汇基础，还能让你更轻松地跟上课堂讲解、提出好问题，并把力学、电学、波这些不同主题的知识串联起来。
A good starting strategy is to treat each new term as a tiny story. Know its scientific definition, what it looks like mathematically and a real-world example. This guide gives you all three for every cluster. Keep a vocabulary notebook or digital flashcards and review words in short bursts – five minutes a day works wonders.
一个好的起步策略是把每个新术语看作一个微小的故事：知道它的科学定义，知道它在数学上长什么样，再配一个现实例子。这份指南为每个词群都提供了这三样东西。准备一个词汇笔记本或电子闪卡，用短时间复习——每天五分钟就能有奇效。
2. Mechanics and Motion | 力学与运动
Motion vocabulary describes how objects move. The difference between distance and displacement, speed and velocity, and the meaning of acceleration are key early hurdles. Remember that scalars only have size (magnitude), while vectors have size and direction. Distance is a scalar; displacement is a vector. Speed = distance ÷ time is a scalar equation; velocity = displacement ÷ time gives a vector result.
运动相关的词汇描述物体如何移动。距离和位移、速率和速度，以及加速度的含义，是初学时几个关键的难点。记住：标量只有大小，矢量既有大小又有方向。距离是标量，位移是矢量。速率 = 距离 ÷ 时间是标量等式，速度 = 位移 ÷ 时间得出的是矢量结果。
| English Term | 中文术语 | Simple Definition |
| Acceleration | 加速度 | Rate of change of velocity; can mean speeding up, slowing down (deceleration), or changing direction. |
| Deceleration | 减速度 / 负加速度 | Negative acceleration; the object is slowing down. |
To quickly lock in acceleration, link the everyday word “accelerate” (go faster) with the physics truth that even turning a corner at constant speed is acceleration because direction changes. Think of a car’s satellite navigation: it shows your speed (scalar), but your velocity changes every time you turn.
要快速记住加速度，就把日常说的“加速”和物理事实挂钩：哪怕匀速转弯也是加速，因为方向变了。想想汽车的卫星导航：它显示的是速率（标量），但你每次转弯时速度（矢量）都改变了。
3. Energy Types and Transfers | 能量类型与转化
Energy is one of the most important ideas in physics. Students need to name energy stores (kinetic, gravitational potential, elastic potential, thermal, chemical, nuclear, electrostatic, magnetic) and describe pathways (mechanical work, electrical work, heating, radiation). The key principle: energy is never created or destroyed, only transferred or converted.
能量是物理中最重要的核心概念之一。学生需要说出能量存储的名称（动能、重力势能、弹性势能、热能、化学能、核能、静电势能、磁能），并描述传递路径（机械做功、电做功、加热、辐射）。核心原理是：能量既不会凭空产生也不会凭空消失，只会转移或转化。
A common mistake is saying “energy is used up”. Replace that with “energy is transferred to a less useful store”, often thermal energy spread into the surroundings. For example, a lamp transfers electrical energy into light (useful) and heat (wasted). Drawing energy transfer diagrams with arrows helps visualise pathways.
一个常见错误是说“能量用光了”。应当换成“能量转移到了一个不太有用的储存中”，比如扩散到环境里的热能。例如，一盏灯把电能转化为光（有用）和热（浪费）。画带有箭头的能量转化图有助于看清路径。
4. Electricity Basics | 电学基础
Circuit vocabulary includes current, voltage, resistance, charge and power. Think of current as the flow of electric charge, measured in amperes (A). Voltage (potential difference) is the push that drives the current, measured in volts (V). Resistance opposes the flow, measured in ohms (Ω). The equation I = V / R is central: current = voltage ÷ resistance.
电路词汇包括电流、电压、电阻、电荷和功率。可以把电流想象成电荷的流动，单位是安培（A）。电压（电势差）是驱动电流的推力，单位是伏特（V）。电阻阻碍流动，单位是欧姆（Ω）。方程 I = V / R 是核心：电流 = 电压 ÷ 电阻。
I = V / R
For components, recognise the difference between series and parallel circuits. In series, current is the same everywhere, but voltage splits. In parallel, voltage stays the same across branches, but current splits. Use the phrase “series shares voltage, parallel shares current” as a fast recall.
关于元件，要认清串联电路和并联电路的区别。串联电路中各处电流相同，电压则被分压。并联电路中各支路电压相同，电流则被分路。用“串联分压，并联分流”这句口诀可以快速回忆。
5. Waves: Sound and Light | 波：声与光
Waves transfer energy without transferring matter. Key words include amplitude, wavelength, frequency, period and speed. Amplitude is the maximum displacement from rest position. Frequency (f, in hertz) is the number of complete waves per second. The wave equation links them:
波传递能量而不传递物质。关键术语有振幅、波长、频率、周期和波速。振幅是离开平衡位置的最大位移。频率（f，单位赫兹）是每秒完整波的个数。波速方程将它们联系在一起：
v = f λ
Transverse waves (light, water ripples) oscillate perpendicular to the direction of energy transfer. Longitudinal waves (sound) oscillate parallel to it, creating compressions and rarefactions. A handy contrast: “transverse is like a stadium wave shaking side to side, longitudinal is like a slinky being pushed and pulled.”
横波（光、水波涟漪）的振动方向与能量传播方向垂直。纵波（声波）的振动方向与之平行，形成密部和疏部。一个便于对比的说法是：“横波像看台上的人浪左右晃动，纵波像弹簧玩具被推拉。”
6. Thermal Physics and States of Matter | 热物理与物质状态
Temperature and heat are not the same. Temperature measures how hot or cold something is – linked to the average kinetic energy of particles. Heat is the transfer of thermal energy from a hotter object to a cooler one. Key terms: conduction, convection, radiation. Conduction happens in solids through vibrating particles and free electrons; convection occurs in fluids when warmer, less dense regions rise; radiation is energy transfer by electromagnetic waves and can happen through a vacuum.
温度和热量不是一回事。温度衡量物体的冷热程度，与粒子的平均动能有关。热量是热能从高温物体向低温物体的传递。核心术语有：传导、对流、辐射。传导通过振动粒子和自由电子在固体中发生；对流是流体中较热、密度较小的区域上升的过程；辐射是通过电磁波传递能量，可以在真空中发生。
In SQA questions, you might need to describe the particle model: solids have fixed shape and volume, liquids fixed volume but variable shape, gases neither fixed shape nor volume. Adding “particles in a solid vibrate around fixed positions” and “particles in a gas move rapidly in random directions” earns full marks on state descriptions.
在 SQA 考题中，你可能需要描述粒子模型：固体有固定的形状和体积，液体有固定体积但形状随容器改变，气体既无固定形状也无固定体积。加上“固体粒子在固定位置附近振动”、“气体粒子沿随机方向快速运动”，就能在状态描述题中拿满分。
7. Forces and Newton’s Laws | 力与牛顿定律
Forces are pushes or pulls measured in newtons (N). Key types: weight, friction, tension, upthrust, normal reaction, air resistance, magnetic, electrostatic. Weight is the force due to gravity and equals mass × gravitational field strength (W = mg). Do not confuse mass (kg, scalar) with weight (N, vector). Mass is the amount of matter; weight depends on location.
力是推或拉，单位是牛顿（N）。常见类型有：重力、摩擦力、张力、浮力、法向反作用力、空气阻力、磁力、电场力。重力是引力造成的力，等于质量乘以引力场强度（W = mg）。不要混淆质量（千克，标量）和重力（牛顿，矢量）。质量是物质的多少，重力取决于所处位置。
W = m g
Newton’s First Law (inertia): an object stays at rest or in uniform motion unless acted on by an unbalanced force. Second Law: F = ma. Third Law: every action force has an equal and opposite reaction force; pairs act on different objects. A quick mnemonic: “One – constant motion, Two – F = ma, Three – action-reaction.”
牛顿第一定律（惯性）：物体将保持静止或匀速直线运动状态，除非受到不平衡力的作用。第二定律：F = ma。第三定律：每一个作用力都有一个大小相等、方向相反的反作用力；这对力作用在不同物体上。速记口诀：“一定律匀速，二定律 F=ma，三定律相反力。”
8. Space and Astrophysics | 太空与天体物理
Even at Year 9, the SQA introduces vocabulary about the Solar System, galaxies and the Universe. Terms: planet, moon, star, solar system, galaxy, universe, orbit, satellite. A planet orbits a star; a moon (natural satellite) orbits a planet. Artificial satellites have various uses: communications, GPS, weather monitoring, scientific research.
即使在九年级，SQA 课程也会引入关于太阳系、星系和宇宙的词汇。术语有：行星、卫星（月亮）、恒星、太阳系、星系、宇宙、轨道、人造卫星。行星围绕恒星运行，卫星（自然卫星）围绕行星运行。人造卫星用途多样：通信、GPS、气象监测、科学研究。
Gravity is the force that keeps objects in orbit. To stay in orbit, a satellite must travel at a speed where the gravitational pull provides the required centripetal force. A common misconception is that there is no gravity in space; in truth, astronauts on the International Space Station experience microgravity because they are in free fall, not because gravity is absent.
引力是维持物体轨道的力。卫星要保持轨道，就必须以适当速度运行，使引力恰好提供所需的向心力。常见误解是太空中没有引力；事实上，国际空间站上的宇航员之所以处于微重力状态，是因为他们处于自由落体，而不是因为引力消失。
9. Key Units and Symbols | 关键单位与符号
Using correct units and symbols is a simple way to avoid losing marks. Memorise the base units for length (metre, m), mass (kilogram, kg), time (second, s), electric current (ampere, A) and temperature (kelvin, K, though celsius, °C, is often used). Derived units like newton (N) and joule (J) must be written correctly. For speed, use m/s, not ms⁻¹ in Year 9 – both are acceptable but clarity matters.
使用正确的单位和符号是避免失分的简单方法。牢记基本单位：长度（米，m），质量（千克，kg），时间（秒，s），电流（安培，A），温度（开尔文，K，不过常用摄氏度 °C）。导出单位如牛顿（N）和焦耳（J）必须书写正确。速度用 m/s，九年级不强制用 ms⁻¹——两者都可以，但清晰最要紧。
| Quantity | Symbol | Unit (symbol) |
| speed | v | metre per second (m/s) |
| force | F | newton (N) |
| energy | E | joule (J) |
| power | P | watt (W) |
Prefixes like kilo- (k, ×1000), centi- (c, ×0.01) and milli- (m, ×0.001) appear often. Converting numbers confidently saves time. Practice turning 2500 m into 2.5 km and 0.3 A into 300 mA until it feels automatic.
词头如 kilo-（k，×1000）、centi-（c，×0.01）和 milli-（m，×0.001）经常出现。熟练换算会节省大量时间。反复练习把 2500 m 换算为 2.5 km、把 0.3 A 换算为 300 mA，直到感觉像本能。
10. Measurement and Practical Skills | 测量与实验技能
Experimental vocabulary covers instruments and techniques. Know the difference between precision (closeness of repeated readings) and accuracy (closeness to the true value). A ruler might give readings to the nearest millimetre, so readings should be written as 12.3 cm rather than just 12 cm to show precision. A zero error occurs when an instrument doesn’t read zero when it should; always check before measuring.
实验词汇涵盖仪器和技术。要分清精密度（重复读数的接近程度）和准确度（与真值的接近程度）。一把直尺或许能读到最近的毫米，因此读数应写作 12.3 cm，而不只是 12 cm，以体现精密度。零点误差是指仪器本应读数为零时却未显示零的情况，测量前一定要检查。
Other words: independent variable (the one you change), dependent variable (the one you measure), control variables (those kept constant). For a spring–mass investigation, the mass added is independent, the extension is dependent, and the spring type and original length are controls.
其他词汇：自变量（你改变的量），因变量（你测量的量），控制变量（保持不变的量）。在弹簧–质量实验中，添加的砝码质量是自变量，伸长量是因变量，弹簧种类和原长是控制变量。
11. Confusing Word Pairs | 易混淆词汇辨析
Some word pairs trick even confident students. Heat vs temperature is one; mass vs weight is another. Reflect vs refract: reflection is bouncing off a boundary, refraction is bending as light enters a new medium. Conductor vs insulator: conductors allow charge or heat to flow easily (metals are good conductors), insulators slow it down (plastic, wood).
有些词汇对即便是自信的学生也会踩坑。热量和温度是一对；质量和重力是另一对。反射和折射又是一组：反射是光在边界上弹回，折射是光进入新介质时发生偏折。导体和绝缘体也是：导体让电荷或热量轻易流过（金属是良导体），绝缘体则阻碍流动（塑料、木材是绝缘体）。
Direct current (DC) vs alternating current (AC): DC flows in one direction only (batteries), AC repeatedly changes direction (mains supply). Series vs parallel circuits: already covered, but linking them can help: series has one loop, parallel has branches. Always test yourself by saying the definitions out loud without looking.
直流电（DC）和交流电（AC）：直流电只沿一个方向流动（电池），交流电则反复改变方向（市电）。串联和并联电路前面讲过，但可以这样联想：串联是一条回路，并联有分支。务必在不看笔记的情况下大声说出定义，进行自测。
12. Mnemonics and Memory Tricks | 记忆术与巧记法
Mnemonics turn lists into vivid mental pictures. For the electromagnetic spectrum in order of increasing frequency: Radio – Micro – Infrared – Visible – Ultraviolet – X-ray – Gamma. Try “Raging Martians Invaded Venus Using X-ray Guns”. Feel free to invent your own in Chinese too – “红紫外线” can remind you that red is low frequency, ultraviolet is high – but better to match the full list.
记忆术能把列表变成生动的脑内画面。按频率递增排列电磁波谱：无线电波 – 微波 – 红外线 – 可见光 – 紫外线 – X 射线 – 伽马射线。不妨试试英文口诀“Raging Martians Invaded Venus Using X-ray Guns”。你也可以自创中文顺口溜，比如“红橙黄绿青蓝紫”对应可见光，但最好覆盖完整排列。
For the colours of visible light from longest to shortest wavelength, many use the name “ROYGBIV” (red, orange, yellow, green, blue, indigo, violet). Another tip: link wave frequency to pitch in sound – high frequency gives high pitch; in light, high frequency moves from red to violet. Associate energy with frequency: higher frequency means more energy per photon.
对于可见光从长波长到短波长的颜色，很多人用“ROYGBIV”（红、橙、黄、绿、蓝、靛、紫）来记忆。另一个技巧：把波频与音调关联——高频声音尖锐；在光中，频率升高从红光向紫光移动。把能量与频率挂钩：频率越高，每个光子携带的能量越多。
Finally, create your own mini-quizzes with a friend. Say a term in English, the other replies with the Chinese translation and one science fact. Active recall is the fastest route to vocabulary mastery.
最后，和朋友一起设计迷你问答。一个人说英文术语，另一个人回答中文翻译和一个科学知识点。主动回忆是掌握词汇最快的路径。
Published by TutorHao | Physics Revision Series | aleveler.com
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