📚 Year 11 SQA Physics: Winter Break Intensive Revision Plan | Year 11 SQA 物理：寒假强化复习计划
The winter break offers a golden opportunity for Year 11 students to consolidate their knowledge and address any weaknesses before the final push towards the SQA exams. This intensive revision plan is tailored for the SQA National 5 Physics course, covering key areas such as dynamics, electricity, waves and radiation. With a structured approach, you can boost your confidence, master problem-solving techniques, and enter the new term fully prepared.
寒假是 Year 11 学生巩固知识、弥补薄弱环节的黄金时期，为迎接 SQA 考试做最后冲刺。这份强化复习计划专为 SQA National 5 物理课程设计，涵盖动力学、电学、波动和辐射等关键领域。通过系统性的复习，你可以增强信心、掌握解题技巧，并以最佳状态迎接新学期。
The plan below is organised into twelve short stages. Each stage combines a clear learning target, the exact physics you must be able to recall, and a practical task you can finish in a single sitting. Because National 5 Physics rewards accuracy in units, symbols and significant figures just as much as conceptual understanding, every stage ends with a self-test so that you never revise passively for long.
下面的计划分为十二个短阶段。每个阶段都包含明确的学习目标、必须牢记的物理知识，以及一次复习就能完成的实操任务。由于 SQA National 5 物理不仅考查概念理解，同样看重单位、符号和有效数字的准确性，因此每个阶段都以一次自测收尾，避免长时间被动阅读。
1. Assess Your Current Knowledge | 评估现有知识水平
Begin by gathering all your class notes, past tests, and the SQA course specification. Identify topics where you scored lower or felt less confident. Make a list of all the key areas: Dynamics, Space, Electricity, Properties of Matter, Waves, and Radiation. Rank them from strongest to weakest. This self-assessment will help you allocate revision time effectively.
首先收集所有的课堂笔记、过往测验卷和 SQA 课程大纲。找出你得分较低或信心不足的主题。列出所有关键领域：动力学、太空、电学、物质特性、波动和辐射。将它们从最强到最弱排序。这种自我评估有助于你合理分配复习时间。
Use a simple traffic-light system on the official course content statements. Mark each statement green if you could explain it to a classmate, amber if you recognise it but would hesitate under timed conditions, and red if it feels unfamiliar. Count the red statements per unit. That count, not your overall feeling about physics, should decide where the largest blocks of holiday time go.
用简单的“红黄绿”标记法对照官方课程内容条目。如果某条你能讲给同学听，标绿；如果认得但限时作答会犹豫，标黄；如果完全陌生，标红。统计每个单元的红条数量。决定寒假时间分配的应该是这个数量，而不是你对物理的整体感觉。
Be honest about the difference between "I have seen this" and "I can do this". Many students lose marks not because they never met the idea, but because they cannot produce it cold, without notes, in an exam hall. Write your honest list in the front of a single revision notebook, and update it at the end of every stage.
要诚实区分“我见过”和“我会做”。很多同学失分并不是因为没学过，而是无法在考场里、不翻笔记、冷启动地写出来。把诚实评估结果写在专用复习笔记本的首页，并在每个阶段结束后更新。
- Green: can define, explain and calculate without help. 绿色：无需帮助即可定义、解释和计算。
- Amber: knows the concept, makes unit or rearrangement errors. 黄色：懂概念，但会犯单位或移项错误。
- Red: cannot recall the relationship or the definition. 红色：记不住公式或定义。
2. Create a Realistic Timetable | 制定切实可行的时间表
Design a study schedule that spreads the workload over the holiday. Aim for 2-3 hours of focused physics revision each day, with short breaks every 45 minutes. Rotate topics to keep your mind fresh. Remember to include time for reviewing mistakes and consolidating difficult concepts. It is often more effective to study a topic, test yourself, and then revisit weak areas than to read passively. Here is an example weekly plan:
制定一份将工作量分散到整个假期的学习时间表。每天安排 2-3 小时专注的物理复习，每 45 分钟休息一下。轮换主题以保持头脑清醒。别忘了留出时间回顾错误和巩固难点。通常，先学习一个主题、自我检测，再回头攻克薄弱点，比被动阅读有效得多。下面是一份每周计划示例：
| Day 日期 | Focus 重点 | Task 任务 |
| Monday | Dynamics 动力学 | Relationships + 10 calculation questions 公式 + 10 道计算题 |
| Tuesday | Electricity 电学 | Circuit diagrams + Ohm's law problems 电路图 + 欧姆定律 |
| Wednesday | Properties of Matter 物质特性 | Heat, latent heat and gas laws 热、潜热与气体定律 |
| Thursday | Waves 波动 | v = fλ drills + ray diagrams 波速练习 + 光路图 |
| Friday | Radiation 辐射 | Nuclear equations + half-life 核方程 + 半衰期 |
| Saturday | Mixed paper 综合卷 | One full past paper under timed conditions 限时完成一套真题 |
| Sunday | Error review 错题复盘 | Redo every wrong question; rest 重做全部错题；休息 |
Two rules make this timetable work. First, never schedule more than three hours of physics in one day, because fatigue turns practice into error rehearsal. Second, always leave Sunday afternoon completely free. A rested brain on Monday recalls relationships far faster than a tired one.
让这张时间表真正生效有两条规则。第一，每天物理复习不超过三小时，因为疲劳会把练习变成错误重复。第二，周日下午必须完全空出来。休息充分的大脑在周一回忆公式的速度远快于疲惫的大脑。
3. Dynamics and Space: Forces, Motion and Gravity | 动力学与太空：力、运动与引力
Dynamics is the backbone of National 5 Physics, and it is the unit where careless unit errors cost the most marks. You must be able to calculate average speed, acceleration, weight, work done, kinetic energy, gravitational potential energy and power, and to interpret velocity-time graphs. Space builds directly on the same ideas: satellites, re-entry, and how gravity supplies the centripetal force that keeps an object in orbit.
动力学是 National 5 物理的骨架，也是因单位粗心丢分最多的单元。你必须会计算平均速度、加速度、重力、功、动能、重力势能和功率，并能解读速度—时间图像。太空部分直接建立在同一套概念上：卫星、再入大气层，以及引力如何提供维持轨道运动所需的向心力。
v̄ t W = mg Eₖ = ½mv² Eₚ = mgh P = E ÷ t
Recall the core definitions precisely. Speed is the distance travelled per unit time; velocity is speed in a stated direction; acceleration is the change in velocity per unit time. Weight is the force of gravity acting on a mass and is measured in newtons, while mass is measured in kilograms and does not change with location. In SQA questions the gravitational field strength on Earth is taken as 9.8 N kg⁻¹ unless stated otherwise.
要准确记住核心定义。速率是单位时间内走过的距离；速度是带有方向的速率；加速度是单位时间内速度的变化量。重力是作用在质量上的引力，单位为牛顿；质量单位为千克，且不随位置改变。SQA 题目中，地球表面重力场强度若无特别说明取 9.8 N kg⁻¹。
Momentum and impulse also appear in this unit. Momentum is mass multiplied by velocity, and it is conserved in collisions and explosions when no external force acts. Impulse is force multiplied by time and equals the change in momentum, which explains why crumple zones and airbags reduce injury: they extend the collision time so the force on the passenger is smaller.
本单元还涉及动量与冲量。动量等于质量乘以速度，在没有外力作用时，碰撞和爆炸过程中动量守恒。冲量等于力乘以时间，等于动量的变化量，这解释了为什么溃缩区和安全气囊能减轻伤害：它们延长了碰撞时间，从而减小乘客受到的力。
p = mv Ft = mv − mu m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
- Always write the relationship, substitute with units, then answer. 先写公式，带单位代入，再作答。
- Check the direction sign in momentum problems before substituting. 动量题代入前先确认方向正负号。
- On velocity-time graphs, the gradient is acceleration and the area under the line is displacement. 速度—时间图上，斜率是加速度，图线下面积是位移。
4. Electricity: Circuits, Ohm's Law and Power | 电学：电路、欧姆定律与电功率
Electricity questions are highly predictable, which makes this unit the fastest place to gain marks. You need charge, current, potential difference, resistance, series and parallel rules, potential dividers, electrical power and the cost of electrical energy. Draw the circuit before you calculate anything: a clear diagram prevents most errors in this topic.
电学题目高度模式化，因此这是提分最快的单元。你需要掌握电荷、电流、电势差、电阻、串联与并联规律、分压电路、电功率以及电能费用。计算前先画电路图：清晰的示意图能避免本主题中的大多数错误。
bsp; P = IV P = I²R E = Pt Cost = E × price per kWh
In a series circuit the current is the same at every point, the supply voltage is shared between components, and the total resistance is the sum of the individual resistances. In a parallel circuit the voltage across each branch is the same, the current splits between branches, and adding a branch decreases the total resistance because there are more paths for charge to flow.
串联电路中，各点电流相同，电源电压由各元件分担，总电阻等于各电阻之和。并联电路中，各支路电压相同，电流在支路间分配；增加支路会使总电阻减小，因为电荷有了更多通路。
Remember that conventional current flows from positive to negative outside the supply, which is opposite to electron flow. Also distinguish alternating current, which repeatedly reverses direction at a frequency measured in hertz, from direct current, which flows in one direction only. Mains electricity in the UK is a.c. at 230 V and 50 Hz, while a cell provides d.c.
记住：在外电路中，常规电流从电源正极流向负极，与电子流动方向相反。还要区分交流与直流：交流电流方向周期性反转，频率单位为赫兹；直流只沿一个方向流动。英国市电为 230 V、50 Hz 的交流电，而电池提供直流电。
- Draw and label every circuit, including the ammeter in series and the voltmeter in parallel. 画并标注每个电路，电流表串联、电压表并联。
- Convert milliamps to amps (÷1000) and kilojoules to joules (×1000) before substituting. 代入前把毫安换算为安（÷1000）、千焦换算为焦（×1000）。
- For cost questions, calculate energy in kilowatt-hours first, then multiply by the unit price. 费用题先算千瓦时电能，再乘以单价。
5. Properties of Matter: Heat, Latent Heat and Gas Laws | 物质特性：热、潜热与气体定律
This unit links the microscopic behaviour of particles to measurable quantities. You must be able to use specific heat capacity, specific latent heat of fusion and vaporisation, pressure, and the combined gas law. The key distinction is that temperature measures average kinetic energy of particles, while heat is energy transferred because of a temperature difference.
本单元把粒子的微观行为与可测量的物理量联系起来。你必须会使用比热容、熔化与汽化的比潜热、压强以及组合气体定律。关键区别在于：温度反映粒子的平均动能，而热量是由于温差而转移的能量。
E = mcΔT E = ml p = F ÷ A P₁V₁ ÷ T₁ = P₂V₂ ÷ T₂
In the heat equations, m is always in kilograms, ΔT in degrees Celsius or kelvin, and the energy released or absorbed in joules. For latent heat there is no temperature change during a change of state, which is why a graph of temperature against time shows a flat plateau while ice melts. In gas law calculations, temperature must always be converted to kelvin by adding 273.
在热学公式中，m 一律用千克，ΔT 用摄氏度或开尔文，吸收或放出的能量用焦耳。潜热过程中状态变化时温度不变，这正是温度—时间图像在冰熔化时出现平台的原因。气体定律计算中，温度必须先加 273 换算为开尔文。
A useful way to remember the pressure–volume–temperature relationship is to treat pressure and volume as directly proportional to kelvin temperature: heating a sealed container at constant volume raises the pressure, while compressing a gas at constant temperature raises the pressure and reduces the volume. Particle collisions with the container walls provide the microscopic explanation.
记忆压强—体积—温度关系的一个好方法是：在体积不变时，压强与开尔文温度成正比；在温度不变时，压缩气体会使压强升高、体积减小。粒子与容器壁的碰撞提供了微观解释。
- Name the substance and the state change in every latent heat answer. 潜热题答案中要写出物质名称与状态变化。
- Never mix °C and K within one calculation. 同一个计算中不要混用摄氏度和开尔文。
- Check whether the question asks for energy absorbed or released. 看清题目问的是吸收还是放出能量。
6. Waves: Sound, Light and the Electromagnetic Spectrum | 波动：声、光与电磁波谱
Waves is the most visual unit in National 5 Physics, and drawing accurate diagrams is often worth as many marks as the calculation. You need wave speed, frequency, period, the electromagnetic spectrum in order, refraction, total internal reflection, critical angle, and the use of converging lenses to form real images.
波动是 National 5 物理中最直观的单元，准确的作图常常和计算一样值分。你需要掌握波速、频率、周期、按顺序排列的电磁波谱、折射、全反射、临界角，以及用凸透镜成实像。
v = fλ T = 1 ÷ f n = sin θ₁ ÷ sin θ₂ sin θc = 1 ÷ n
Frequency is measured in hertz and equals the number of waves passing a point each second. The period is the time for one complete wave and is the reciprocal of frequency. Wave speed depends on the medium, so when a wave enters a denser medium its speed and wavelength decrease while its frequency stays constant, which is exactly why refraction occurs.
频率单位为赫兹，等于每秒通过某点的完整波数。周期是完成一个完整波所需的时间，与频率互为倒数。波速取决于介质，因此波进入更密的介质时，波速和波长减小而频率不变，这正是折射产生的原因。
powers optical fibres, which carry signals in telecommunications and in medical endoscopes. In the electromagnetic spectrum, radio, microwave, infrared, visible, ultraviolet, X-ray and gamma rays all travel at 3 × 10⁸ m s⁻¹ in a vacuum.
当光从较密介质射向较疏介质，且入射角大于临界角时，会发生全反射。这一原理支撑了光纤技术，用于通信和医用内窥镜。在电磁波谱中，无线电波、微波、红外线、可见光、紫外线、X 射线和 γ 射线在真空中都以 3 × 10⁸ m s⁻¹ 传播。
- Use a sharp pencil and a ruler for every ray diagram. 光线图必须用削尖的铅笔和直尺。
- Mark the normal as a dashed line perpendicular to the surface. 法线用垂直于界面的虚线标出。
- Name the wave region, not just the wavelength, when explaining applications. 解释应用时写出波段名称，而不只是波长。
7. Radiation: Nuclear Physics and Safety | 辐射：核物理与安全
Radiation questions combine recall and calculation. You must know the three types of ionising radiation, their penetration and ionising power, how to write and balance nuclear equations, the meaning of half-life, and how absorbed dose and equivalent dose are used to express risk to living tissue.
辐射题目兼具记忆与计算。你必须了解三种电离辐射及其穿透力与电离能力，会书写并配平核反应方程，理解半衰期的含义，并知道吸收剂量与等效剂量如何用来表示对活体组织的风险。
| Radiation 辐射 | Nature 本质 | Stopped by 阻挡物 |
| Alpha α | 2 protons + 2 neutrons 两个质子加两个中子 | Paper, few cm of air 纸、几厘米空气 |
| Beta β | Fast electron 高速电子 | Few mm of aluminium 几毫米铝 |
| Gamma γ | Electromagnetic wave 电磁波 | Thick lead, several cm 厚铅、数厘米 |
In nuclear equations the mass number at the top and the atomic number at the bottom must both balance. Alpha decay reduces the mass number by 4 and the atomic number by 2; beta decay leaves the mass number unchanged but increases the atomic number by 1; gamma emission changes neither. Half-life is the time for half the nuclei in a sample to decay, and it is unaffected by temperature, pressure or chemical state.
核反应方程中，左上角的质荷数与左下角的原子序数都必须配平。α 衰变质数减 4、原子序数减 2；β 衰变质数不变、原子序数加 1；γ 发射两者都不变。半衰期是样品中一半原子核衰变所需的时间，它不受温度、压强或化学状态影响。
D = E ÷ m H = D × wR
Absorbed dose is measured in grays and describes energy absorbed per kilogram of tissue. Equivalent dose is measured in sieverts and multiplies absorbed dose by a radiation weighting factor, so that alpha radiation, which is far more damaging per unit of energy, gives a larger equivalent dose than the same absorbed dose of beta or gamma radiation.
吸收剂量用戈瑞表示，描述每千克组织吸收的能量。等效剂量用希沃特表示，等于吸收剂量乘以辐射权重因子，因此同样吸收剂量下，单位能量危害更大的 α 辐射给出的等效剂量高于 β 或 γ 辐射。
8. Problem-Solving and Numeracy Skills | 解题与计算能力
Most lost marks in National 5 Physics come from arithmetic and presentation rather than from physics. Adopt one fixed four-step routine and use it in every calculation question throughout the holiday, so that it becomes automatic by the time you sit the exam.
National 5 物理的失分大多来自运算和书写规范，而不是物理概念本身。整个寒假固定使用一套四步解题
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