📚 PH03 International Physics A: Application Question Techniques | PH03国际物理A：应用题解题技巧
The PH03 International Physics A examination on 30 May 2023, starting at 07:00 GMT, is designed to assess your ability to apply physical principles in practical and theoretical contexts. Application questions often carry significant weight and require a systematic approach. This guide outlines proven techniques to help you maximise your score on this paper.
2023年5月30日格林尼治标准时间7:00开考的PH03国际物理A考试，旨在评估你在实际与理论情境中应用物理原理的能力。应用题通常占分比重大，需要有系统的方法。本指南将概述行之有效的技巧，助你在该试卷中取得最佳成绩。
1. Understanding the Command Words | 理解指令词
Every question begins with a command word that tells you exactly what to do. Common terms include ‘Calculate’, ‘Determine’, ‘Explain’, ‘Describe’, ‘Suggest’, and ‘Estimate’. For ‘Calculate’, you must show numerical working with the final answer and unit. ‘Determine’ often implies using a graph or provided data to find a value. ‘Explain’ requires a scientific justification, frequently linking cause and effect. ‘Describe’ calls for a factual account without explanation. Recognising these nuances ensures you answer precisely what is asked.
每个问题都以指令词开始，它准确告诉你需要做什么。常见术语包括“Calculate”（计算）、“Determine”（测定）、“Explain”（解释）、“Describe”（描述）、“Suggest”（建议）和“Estimate”（估算）。对于“Calculate”，你必须展示数值演算过程，给出最终答案和单位。“Determine”通常意味着利用图表或所给数据求出某个值。“Explain”要求提供科学依据，常常联系因果。“Describe”则要求进行事实性叙述而无需解释。识别这些细微差别，能确保你准确回应题目要求。
2. Extracting Data and Units | 提取数据与单位
Read the question carefully and highlight all given quantities, including their numerical values and units. Convert all units to SI before substituting into equations — a common source of error is mixing km with m or hours with seconds. The table below summarises key conversions you should memorise:
仔细阅读题目，标出所有已知量，包括其数值和单位。在代入方程前，将所有单位转换为国际单位制——混淆千米与米或小时与秒是常见的错误来源。下表总结了应牢记的关键换算关系：
| Non-SI Unit | Conversion to SI | 非SI单位 | 转换为SI |
|---|---|---|---|
| km | × 1000 → m | 千米 | × 1000 → 米 |
| hour (h) | × 3600 → s | 小时 | × 3600 → 秒 |
| g cm⁻³ | × 1000 → kg m⁻³ | 克每立方厘米 | × 1000 → 千克每立方米 |
| km h⁻¹ | ÷ 3.6 → m s⁻¹ | 千米每小时 | ÷ 3.6 → 米每秒 |
Once in SI, write down the symbol for each quantity (e.g. m = 2.0 kg, v = 15 m s⁻¹). This systematic listing prevents misreading and makes it easier to select the appropriate formula.
转换为SI单位后，写下每个物理量的符号（例如 m = 2.0 kg, v = 15 m s⁻¹）。这一系统性的列举可避免误读，并使你更容易选出恰当的公式。
3. Drawing Conclusive Diagrams | 绘制总结性示意图
For mechanics problems, sketch a free‑body diagram showing all forces as arrows; label them with their magnitudes if known. For circuits, redraw the circuit with component values. A clear diagram helps you visualise relationships and often reveals the next step. Even if the question does not explicitly ask for a diagram, your own sketch can prevent sign errors and clarify vectors.
对于力学问题，画出受力分析图，用箭头表示所有力；如果已知大小，将它们标出。对于电路问题，重画
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