IPC Physics: Phenomenon Explanation Questions – Key Points & Answering Methods | IPC物理：现象解释题考查要点与答题方法

📚 IPC Physics: Phenomenon Explanation Questions – Key Points & Answering Methods | IPC物理：现象解释题考查要点与答题方法

Phenomenon explanation questions appear in nearly every IPC physics assessment. They present a real-life observation and ask you to use physics to explain it. These questions are not about memorising facts – they test your ability to think like a scientist and communicate your reasoning clearly.

现象解释题几乎出现在每一次IPC物理测评中。这类题目给出一个生活中的真实观察，要求你运用物理学原理解释它。它们考查的不是死记硬背，而是像科学家一样思考，并清晰表达推理过程的能力。

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1. What Are Phenomenon Explanation Questions? | 什么是现象解释题？

A phenomenon explanation question gives you an everyday event – such as a puddle drying up, a shadow moving, or a bulb lighting – and asks you to “explain why” or “use the idea of … to explain this observation.” The mark scheme rewards three things: the correct physics principle, the correct link to the situation, and precise scientific language.

现象解释题会给出一个日常事件——比如水坑变干、影子移动或灯泡发光——并要求你”解释为什么”或”运用……的概念解释这一观察”。评分标准看重三件事：正确的物理原理、正确的情境联系，以及精确的科学语言。

These questions usually carry 2 to 4 marks in IPC tests. That means the examiner expects two to four connected points. A single vague sentence cannot earn full marks, and an unconnected list of facts will also lose credit.

这类问题在IPC测试中通常占2到4分。这意味着阅卷者期待两到四个相互关联的要点。一句含糊的话无法拿到满分，而一盘散沙式的事实罗列同样会被扣分。

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2. Key Points Assessed | 考查要点

IPC phenomenon questions assess four distinct skills. You need all four to score highly.

IPC现象题考查四种不同的技能。你需要全部具备才能拿高分。

First, recall of the correct principle. You must name the exact physics idea involved, such as evaporation, air pressure, friction, or energy transfer. Without the correct principle, no credit is given even if your description is detailed.

第一，正确原理的回忆。你必须准确说出所涉及的物理概念，例如蒸发、气压、摩擦力或能量转移。没有正确的原理，即使描述再细致也无法得分。

Second, application to the exact situation. A generic definition of evaporation does not explain why a puddle dries faster on a windy day. You must mention wind removing water vapour and speeding up evaporation.

第二，将原理应用到具体情境。蒸发的一般定义并不能解释为什么水坑在风天干得更快。你必须提到风带走水蒸气并加快蒸发速率。

Third, a logical cause-and-effect chain. You must connect the principle to the observation step by step, using connectives such as “because”, “therefore”, and “this means that”. The examiner needs to see each stage of your thinking.

第三，因果逻辑链。你必须用”因为””所以””这意味着”等连接词，将原理与观察逐步连接起来。阅卷者需要看到你思维的每一个环节。

Fourth, correct scientific vocabulary. Use “evaporation” not “drying up”, “air pressure” not “sucking force”, “energy transfer” not “power flow”. Precise words show precise understanding.

第四，正确的科学词汇。要说”蒸发”而不是”干掉”，说”气压”而不是”吸力”，说”能量转移”而不是”动力流动”。精确的词语体现精确的理解。

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3. Common Question Types | 常见题型

IPC phenomenon questions appear in several formats. Knowing the format helps you choose the right response structure.

IPC现象题有几种常见形式。了解题型能帮助你选择正确的回答结构。

Question Type	What It Asks	Example Stem
Cause explanation	Give the reason for an observed event	“Why does a balloon expand when left in the sun?”
Prediction + explanation	State what will happen, then explain why	“What will happen to the ice cube in the warm room? Explain your answer.”
Comparison	Explain why two situations differ	“Why does the metal cup feel colder than the plastic cup?”
Evaluation	Judge a statement and justify your view	“A student says the bulb is broken because the battery is flat. Do you agree?”

Watch the command words carefully. “Explain” requires a reason. “Predict” requires an outcome first and a reason second. “Describe” only asks for what is happening. “Suggest” allows a plausible idea, not necessarily the textbook one.

要仔细留意指令词。”Explain”需要给出理由。”Predict”需要先说明结果，再给出理由。”Describe”只要求描述正在发生什么。”Suggest”允许提出合理猜想，不一定是教科书上的标准答案。

A common IPC trick is to hide a physics principle inside a familiar object. A bicycle reflects light (reflection), a whistle produces sound (vibration), a shadow changes length (light travels in straight lines). Train yourself to ask: “Which physics idea is hiding in this object?”

IPC常见的出题技巧是把物理原理藏在熟悉的事物中。自行车反光（反射）、哨子发声（振动）、影子变长（光沿直线传播）。要训练自己发问：”这个物体里藏着什么物理原理？”

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4. The PEC Answering Framework | PEC答题框架

The PEC framework keeps your answers organised and complete. It has three parts.

PEC框架能让你的答案结构完整、条理清晰。它由三部分组成。

Principle → Evidence → Conclusion

P – Principle. Name the physics law or idea in one clear sentence. For example: “Warm air rises because it is less dense than cold air.” This shows the examiner which concept you are using.

P – 原理。用一句清晰的话说出物理定律或概念。例如：”热空气上升，因为它的密度比冷空气小。”这告诉阅卷者你在运用哪个概念。

E – Evidence. Connect the principle to details written in the question. Mention the actual objects, temperatures, materials, or conditions given. This proves you are not just repeating a memorised definition.

E – 证据。将原理与题目中的具体信息联系起来。提到题目给出的实际物体、温度、材料或条件。这证明你不是在复述背下来的定义。

C – Conclusion. End with the observed result, clearly linked to your principle and evidence. Use “therefore” or “so” to signal the final step.

C – 结论。以观察到的结果收尾，并明确将其与你的原理和证据相连。用”因此”或”所以”来标示最后一步。

For a 3-mark question, aim for three sentences: one for P, one for E, one for C. For a 4-mark question, expand E into two sentences or add a second principle.

对于3分题，目标写三句话：一句P，一句E，一句C。对于4分题，把E扩展成两句，或补充第二个相关原理。

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5. Step-by-Step Answering Method | 分步答题方法

Follow these five steps in the exam. With practice, the whole process takes less than two minutes per question.

考试中按下面五步操作。多加练习后，每道题的完整流程不到两分钟就能完成。

• Step 1: Read the question twice and underline all keywords. Circle the object, the action, and the command word. This prevents you from answering the wrong question.
• 第一步：读题两遍，划出所有关键词。圈出物体、动作和指令词。这样可以避免答非所问。
• Step 2: Identify the physics principle. Ask: “What topic in my notes does this belong to?” Force, energy, light, sound, electricity, materials – pick the one section that fits.
• 第二步：确定物理原理。问自己：”这属于我笔记中的哪个主题？”力、能量、光、声、电、材料——选择最匹配的一个板块。
• Step 3: Build the P-E-C chain in your head. Say it quietly to yourself before writing. If your chain has a gap, fill it before you put pen to paper.
• 第三步：在脑海中构建P-E-C链条。动笔前先小声说一遍。如果链条有断裂，先补上再写。
• Step 4: Write in full sentences. Use the connectives “because”, “so”, and “this means that”. Do not use bullet points unless the question allows them.
• 第四步：用完整句子书写。使用”因为””所以””这意味着”等连接词。除非题目允许，否则不要使用要点列表。
• Step 5: Check the mark value. If the question is worth 3 marks, you need at least 3 distinct linked ideas. Tick each sentence as you re-read your answer.
• 第五步：核对分值。如果题目为3分，你至少需要3个不同的关联要点。重读答案时逐个打勾。

The most common time-management error is writing a long introduction to the topic. Do not do this. Start directly with the principle and answer the question in the first sentence.

最常见的时间管理错误是写一段冗长的主题介绍。千万不要这样做。直接从原理入手，在第一句就回答问题。

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6. Using Scientific Language | 科学语言技巧

IPC examiners reward the use of scientific terms. Everyday words are often too vague to earn marks. The table below shows common upgrades.

IPC阅卷者会奖励科学术语的使用。日常词汇往往过于模糊，难以得分。下表列出常见的用语升级。

Everyday Word	Scientific Word	Why It Matters
coldness	heat energy transfer / low temperature	Cold is not a substance; it is a lack of heat energy.
sucking force	air pressure difference	No object “sucks”; higher pressure pushes.
bounces off	reflects / changes direction	Reflection is the precise light behaviour.
gets hot	temperature rises / gains heat energy	“Gets hot” is informal; “temperature rises” is measurable.
push / pull	force / exerts a force	Force is the scientific name for a push or pull.

Learn these 12 core verbs for

Published by TutorHao | Physics Revision Series | aleveler.com

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