Mastering Extended Response Questions in GCSE Physics (Eduqas) | 攻克Eduqas物理长答题：写作框架与范文

📚 Mastering Extended Response Questions in GCSE Physics (Eduqas) | 攻克Eduqas物理长答题：写作框架与范文

Extended response questions in Eduqas GCSE Physics often carry 6 marks or more. They require more than just recalling a fact; you need to structure your answer logically, use precise scientific terminology, and often link several concepts together. This guide provides you with a clear writing framework, complete with model answers, to help you unlock top marks on those high-stakes 'describe', 'explain' and 'evaluate' questions.

Eduqas 物理考试中的长篇简答题往往占6分或更多。这类题目不仅要求回忆事实，更需要你逻辑清晰地组织答案，使用准确的科学术语，并经常把多个概念串联起来。这份指南将为你提供一套清晰的写作框架和完整范文，帮助你在那些高分值的“描述”、“解释”和“评估”题目中拿下满分。

1. Understanding the Command Words | 理解指令词

Eduqas exam questions use specific command words that tell you exactly what to do. 'State' means give a brief fact, while 'describe' asks you to say what happens, often in a sequence or with observed properties. 'Explain' goes further: you must give reasons using scientific principles. 'Compare' requires similarities and differences, and 'evaluate' asks for a judgment backed by evidence, often discussing advantages, disadvantages or limitations.

Eduqas 考试题目使用特定的指令词，告诉你具体需要做什么。"State" 意味着给出简短的事实；"describe" 要求你说出发生什么，通常按顺序或描述观察到的性质；"explain" 更进一步，要求你运用科学原理给出原因；"compare" 需要说明相似点与不同点；"evaluate" 则要求用证据支撑做出判断，往往讨论优点、缺点或局限性。

Command Word	Meaning	指令词	含义
State	Give a concise answer, no explanation needed.	陈述	给出简明答案，无需解释。
Describe	Say what happens or what you would see/measure.	描述	叙述发生了什么，或你会看到/测量到什么。
Explain	Give reasons for a phenomenon using scientific ideas.	解释	运用科学概念为某一现象给出原因。
Compare	Identify similarities and differences, often using 'whereas'.	比较	找出相似与差异，常用“而”连接。
Evaluate	Make a judgment, discussing both sides and evidence.	评估	做出判断，讨论两方面和证据。

---

2. The CER Framework for Scientific Explanations | 科学解释的CER框架

For 'explain' questions, adopting the CER structure (Claim, Evidence, Reasoning) builds a perfect answer. First, state your claim – the scientific outcome that happens. Then, provide evidence, which may be from the scenario given, a graph, or data. Finally, add reasoning that links the evidence to the claim using a fundamental scientific law or principle. This shows the examiner you can apply theory to context.

对于“解释”类问题，采用 CER 结构（主张、证据、推理）可以构建出完美的答案。首先，陈述你的主张——即发生的科学结果。然后，提供证据，这可能来自题目所给的情景、图表或数据。最后，添加推理，运用一个基本的科学定律或原理将证据与主张联系起来。这向考官展示了你能够把理论应用于具体情景。

For example, if asked to explain why a plastic comb can attract tiny pieces of paper after being rubbed on a wool sweater, your claim is 'the comb attracts the paper'. Your evidence is 'the comb was rubbed on wool and then brought near paper pieces which moved towards it'. The reasoning is 'rubbing transfers electrons from the wool to the comb, giving the comb a negative charge; the neutral paper pieces are then attracted by electrostatic induction because electrons are repelled to the far side of the paper, creating a positive region nearer the comb'.

例如，如果题目要求解释为什么塑料梳子在羊毛衫上摩擦后能吸起小纸屑，你的主张是“梳子吸引纸屑”。证据是“梳子在羊毛上摩擦后靠近纸屑，纸屑移向梳子”。推理是“摩擦使电子从羊毛转移到梳子上，使梳子带负电；中性的纸屑随后因静电感应而被吸引，因为电子被排斥到纸屑远端，靠近梳子的区域带上正电”。

---

3. Structuring a "Describe" Question | “描述”类问题的结构

A 'describe' question often asks you to detail the steps of an experiment, or the stages of a process like the journey of a wave or the formation of a star. Use logical sequencing words: 'first', 'next', 'then', 'finally'. For a practical, specify apparatus, precise actions, and measurements to be taken. Do not include explanations unless the question explicitly asks for them. Stick to what happens and what you observe.

“描述”类问题常要求你详细说明实验的步骤，或某一过程的阶段，如波的传播或恒星的形成。使用逻辑顺序词：“首先”、“接着”、“然后”、“最后”。如果是实验题，要说明仪器、精确的操作和需进行的测量。除非题目明确要求，否则不要加入解释。紧扣发生什么和你观察到什么。

Consider a describe question on finding the focal length of a converging lens. Your answer must map out the practical: set up the lens, a screen and an illuminated object on a bench; adjust the position of the screen until a sharp real image appears; measure the distance from the lens to the object (u) and from the lens to the screen (v); repeat for several object distances; after collecting data, plot a graph of 1/v against 1/u, where the focal length f can be found from the intercept. No 'why' needed.

考虑一道关于求凸透镜焦距的描述题。你的答案必须列出实践步骤：在光具座上安装透镜、光屏和被照亮的物体；调整光屏位置直到出现清晰的实像；测量物距 u 和像距 v；重复更换物距多次；收集数据后，画出 1/v 对 1/u 的图，通过截距求出焦距 f。无需解释“为什么”。

---

4. Structuring an "Explain" Question | “解释”类问题的结构

An explain question demands a clear chain of causality. Use linking words such as 'because', 'therefore', 'due to', 'consequently'. Begin by identifying what occurs, then detail the underlying physics: forces acting, energy transfers, particle behaviour, or wave properties. Use the CER approach, ensuring each reason connects to the next. If you mention an equation, write it and tell what it shows.

“解释”题要求清晰的因果链条。使用连接词如“因为”、“因此”、“由于”、“从而”。起始句指出发生了什么，然后详述背后的物理原理：作用的力、能量转移、粒子行为或波的特性。运用 CER 方法，确保每个原因与下一个环环相扣。如果提到方程式，写下它并说明它所揭示的关系。

An example: explain why a metal rod feels colder than a wooden rod at the same room temperature. Explain that the metal feels colder because it conducts heat away from your hand faster. Heat energy transfers from your warm hand to the cooler metal by conduction. Metal has free electrons that move rapidly, carrying kinetic energy away, whereas wood is an insulator with very few free electrons, so the energy transfer is much slower. Therefore, your skin senses a lower temperature on the metal.

例如：解释为什么在相同室温下金属棒感觉比木棒更凉。解释：金属感觉更凉是因为它更快地从你的手传导走热量。热能通过传导从你温暖的手传递到较凉的金属。金属有自由电子能快速移动，带走动能，而木头是绝缘体，几乎没有自由电子，因此能量转移慢得多。所以，你的皮肤感觉到金属上的温度更低。

---

5. Structuring an "Evaluate" or "Compare" Question | “评估”或“比较”类问题的结构

For evaluate questions, you must weigh up pros and cons, reliability of data, or limitations of a model. Start by stating your conclusion clearly: 'Overall, the method is reliable because…', 'Wind turbines are more environmentally friendly because… but they have limitations…'. Use 'however', 'on the other hand', and back each point with a reason. For compare questions, present similarities and differences systematically. Use comparative phrases like 'Compared to…', 'Both A and B… whereas…'.

对于评估题，你必须权衡利弊、数据可靠性或模型局限性。先清晰陈述结论：“总体而言，该方法可靠，因为……”“风力涡轮机更环保，因为……但它有局限性……”。使用“然而”、“另一方面”，每个观点都要有理有据。对于比较题，系统性地呈现相同点和不同点。用比较性短语如“与……相比”、“A和B都……而……”。

In a compare question about electromagnetic waves, you could say: 'Both X-rays and gamma rays are ionising and can penetrate materials, whereas visible light does not ionise and is reflected by many surfaces. Radio waves have the longest wavelength, while gamma rays have the shortest frequency.' Use a table if appropriate to present contrasting features clearly.

在关于电磁波的比较题中，你可以写道：“X射线和伽马射线都是电离辐射，能穿透物质，而可见光不会电离且被许多表面反射。无线电波波长最长，而伽马射线频率最高。”若合适，用表格清晰展示对比特征。

---

6. Writing About Experimental Methods | 实验方法写作技巧

Practical-based questions require you to describe a method as if you were writing a set of clearly numbered instructions. Include: the list of apparatus, the independent variable that you will change, the dependent variable you will measure, and the controls you will keep constant. Mention how you will ensure accuracy (e.g. repeat readings and calculate a mean, avoid parallax error by reading a measuring cylinder at eye level).

实验类题目要求你描述方法，就像在编写一组清晰的编号指令。包含：仪器列表、你要改变的独立变量、你要测量的因变量，以及你要保持恒定的控制变量。提及如何确保准确性（例如，重复读数并计算平均值，通过平视量筒避免视差错误）。

For a required practical like investigating the resistance of a wire, say: ' ure the length of the wire between the crocodile clips. Record the current and potential difference for at least five different lengths. Keep the wire material and diameter constant. Repeat at each length and calculate mean resistance using R = V/I.'

对于探究导线电阻的必修实验，可以写：“将电池、电流表和待测导线串联，电压表并联在导线两端。用米尺测量鳄鱼夹之间的导线长度。记录至少五个不同长度下的电流和电压。保持导线材料和直径不变。每个长度重复实验，并用 R = V/I 计算平均电阻。”

---

广告 / Sponsored

7. Incorporating Equations and Calculations | 融入方程与计算

When a question requires numerical working, always show the equation you will use first before substituting numbers. Write out the equation using standard symbols clearly. Then substitute values with units. Write your final answer with correct significant figures and a unit. To gain communication marks, you can explain in words what each step is doing. This is especially crucial in multi-step calculations like working out efficiency or specific heat capacity.

当题目需要数值计算时，总是在代入数字前先写下你将使用的公式。用标准符号清晰地写出公式。然后代入带单位的数值，写出最终答案，保留正确的有效数字并带上单位。要拿到表达分，你可以用文字解释每一步在做什么。这在效率或比热容等多步计算中尤其关键。

For example, a question on kinetic energy:

Eₖ = ½ m v²

(15)² = ½ × 1200 × 225 = 135 000 J or 135 kJ. State the answer clearly and check the unit.

例如，一道关于动能的题目：

Eₖ = ½ m v²

其中 m 单位为 kg，v 单位为 m/s。对于质量 1200 kg、速度 15 m/s 的汽车，代入：Eₖ = ½ × 1200 × (15)² = ½ × 1200 × 225 = 135 000 J 或 135 kJ。清晰地陈述答案并检查单位。

---

8. Model Answer 1: Density Experiment (Describe) | 范文一：测量密度（描述）

Question: Describe a method to determine the density of an irregularly shaped solid object, such as a stone.

题目：描述一种测定不规则固体（如石块）密度的方法。

water and note the initial volume V₁. Tie the stone with a thin thread and gently lower it into the water, making sure it is fully submerged without splashing. Record the new volume V₂. The volume of the stone is V₂ − V₁. Finally, calculate the density ρ using the equation ρ = m / V, where ρ is density, m is mass and V is volume. State the unit, for example g/cm³ or kg/m³. To improve accuracy, repeat the volume measurement three times and take a mean.

首先，用电子天平测量石块的质量。记录质量 m，单位克或千克。接着，往量筒中加部分水，记下初始体积 V₁。用细线系住石块，将其轻轻浸没入水中，确保完全浸没且不溅水。记录新的体积 V₂。石块的体积为 V₂ − V₁。最后，运用公式 ρ = m / V 计算密度 ρ，其中 ρ 为密度，m 为质量，V 为体积。标明单位，例如 g/cm³ 或 kg/m³。为了提高准确性，体积测量重复三次取平均值。

This answer follows a logical sequence, names apparatus, repeats measurements, and calculates density with the correct equation, hitting all the marks for a 'describe' practical.

这份答案按逻辑顺序叙述，列出了器材，提到了重复测量，并用正确公式计算密度，全面覆盖了“描述”类实验题的得分点。

---

9. Model Answer 2: Why a Parachutist Reaches Terminal Velocity (Explain) | 范文二：跳伞者为何达到终极速度（解释）

Question: Explain why a skydiver reaches a constant speed known as terminal velocity during free fall before opening the parachute.

题目：解释为什么跳伞者在开伞前的自由下落过程中会达到一个恒定的速度，即终极速度。

Initially, when the skydiver jumps out of the plane, the only significant force acting on them is their weight due to gravity, so they accelerate downwards. As their speed increases, air resistance (drag) also increases because drag is proportional to speed squared. The resultant downward force becomes weight minus air resistance, so the acceleration decreases. Eventually, air resistance grows to become equal in size to the weight. At this point, the resultant force is zero, and according to Newton's first law, the skydiver no longer accelerates; they continue moving at a constant speed called terminal velocity. The skydiver stops accelerating but remains in motion.

起初，当跳伞者跳出飞机时，作用在他们身上的唯一显著的力是重力引起的重量，因此他们向下加速。随着速度增加，空气阻力（拖曳力）也增大，因为阻力与速度的平方成正比。向下的合力变为重量减去空气阻力，因此加速度减小。最终，空气阻力增大到与重量大小相等。此时，合力为零，根据牛顿第一定律，跳伞者不再加速；他们以恒定速度继续运动，这个速度称为终极速度。跳伞者停止加速，但仍保持运动状态。

This explanation uses CER: the claim is constant speed, evidence is the increasing drag, reasoning links Newton's laws and forces. It also uses precise causal links like 'as... increases', 'therefore', 'eventually', making it a top-band answer.

此解释运用了 CER：主张是恒定速度，证据是不断增大的阻力，推理则联系了牛顿定律与力。它还使用了诸如“随着……增加”、“因此”、“最终”等精确的因果连接词，使其成为高分答案。

---

10. Model Answer 3: Evaluating Energy Transfers in a Bungee Jump (Evaluate) | 范文三：评估蹦极中的能量转换

Question: Evaluate the energy transfers taking place from the moment a bungee jumper leaves a platform until they reach the lowest point of the jump. Discuss the usefulness of energy conservation.

题目：评估从蹦极者离开平台直至到达最低点过程中的能量转换。讨论能量守恒的有用性。

Overall, energy is conserved throughout the bungee jump. At the start, the jumper has maximum gravitational potential energy (GPE) and zero kinetic energy (KE). As they fall before the rope tightens, GPE is transferred into KE, so the jumper speeds up. Once the bungee rope becomes taut and stretches, the kinetic energy begins to be transferred into elastic potential energy (EPE) stored in the rope. At the lowest point, all the GPE lost has been stored as EPE, assuming no air resistance. In reality, some energy is transferred to thermal energy due to air resistance and internal heating of the rope, so the mechanical energy store is not perfectly conserved, but the total energy of the system including thermal energy always remains constant. The conservation of energy is useful because it allows us to predict the maximum stretch of the rope by equating GPE lost to EPE gained, giving a good approximation. However, to improve accuracy, one must account for dissipative forces.

总体而言，整个蹦极过程中能量是守恒的。开始时，蹦极者具有最大重力势能，动能为零。当绳索未拉紧时自由下落，重力势能转化为动能，因此速度增加。一旦蹦极绳绷紧并伸长，动能便开始转化为储存在绳中的弹性势能。在最低点，忽略空气阻力，所有损失的重力势能都以弹性势能的形式储存起来。实际上，部分能量由于空气阻力和绳索内部发热转化为热能，因此机械能并非完美守恒，但包含热能在内的系统总能量始终保持不变。能量守恒很有用，因为它让我们通过令损失的重力势能等于获得的弹性势能来预测绳索的最大伸长量，从而得出很好的近似值。然而，为提升准确性，必须考虑耗散力。

This evaluate answer makes a clear judgment 'overall energy is conserved', discusses both ideal and real-world cases, and mentions usefulness and limitations, showing balanced evaluation.

这份评估答案做出了明确判断“总体能量守恒”，讨论了理想化和实际情景，并提及了有用性和局限性，展现出均衡的评估。

---

11. Common Pitfalls and How to Avoid Them | 常见错误与规避

Many students lose marks by writing 'it has more energy' without specifying what type of energy: kinetic, gravitational potential, thermal? Always name the energy store or force clearly. Another common error is missing units or not matching units in equations. For instance, using grams instead of kilograms in force calculations. A third pitfall is using vague words like 'it gets bigger' rather than precise scientific terms like 'the current increases'. Finally, failing to link back to the scenario costs you communication marks; end each explanation by tying the science to the question context.

许多学生失分是因为写“它具有更多能量”，却未指明是哪种能量：动能、重力势能、热能？务必明确说出能量储存或力的名称。另一个常见错误是遗漏单位或方程中单位不匹配。例如在力的计算中用克代替千克。第三个陷阱是使用模糊词汇如“它变大了”，而不是精确科学术语“电流增大”。最后，没有回扣情景会让你丢掉表达分；在每段解释的末尾，要把科学原理与题目情景联系起来。

Avoid these by: read the question twice and underline command words; check your answer against the mark scheme if available; always write a conclusion sentence that refers directly to the given scenario. For 'evaluate' questions, ensure you have mentioned at least one advantage and one disadvantage.

规避方法：把题目读两遍，划出指令词；若有评分标准，将答案与之对照；始终写一句直接指向给定情景的总结句。对于“评估”题，确保至少提到一个优点和一个缺点。

---

12. Final Exam Tips | 考场终极建议

In the exam, watch the marks allocation: a 6-mark question expects about 5–6 clear points, each linking a key idea to the context. Manage your time – allow roughly 1 minute per mark. For extended writing, take 30 seconds to plan three or four bullet points on the question paper before you start. This will prevent you from going off on a tangent. Use the frameworks: CER for explain, logical sequence for describe, pros/cons for evaluate. Write legibly and underline key terms like 'terminal velocity' or 'conservation of energy'.

考试中，注意分值分配：一道6分题期望包含约5-6个清晰要点，每个要点将关键概念与情景连接。管理好时间——大约1分对应1分钟。对于长篇写作，动笔前花30秒在试题纸上列出三到四个要点，这样能防止偏题。运用框架：“解释”用 CER，“描述”用逻辑顺序，“评估”用正反两面。书写整洁，在“终极速度”或“能量守恒”等关键术语下划线。

Practice with past Eduqas papers. Write model answers, compare them with mark schemes, and redraft until your answer meets the top band descriptors. Regular deliberate practice will make the frameworks second nature, so you can confidently tackle any long-answer question on the day.

用以往Eduqas真题进行练习。写出范文答案，与评分标准比对，反复修改直至达到最高分档描述的要求。经常针对性练习会让框架变成你的本能，使你能在考试当天自信地攻克任何长答题。

Published by TutorHao | Physics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）