AQA A Level Physics Insert Unit 2 January 2021 | AQA 物理 A Level 第二单元资料插页（2021 年 1 月）

📚 AQA A Level Physics Insert Unit 2 January 2021 | AQA 物理 A Level 第二单元资料插页（2021 年 1 月）

The AQA A Level Physics Unit 2 insert is a compact data and formulae booklet supplied in the exam. It covers mechanics, materials and waves. Using it quickly and accurately can save time, reduce recall errors and earn method marks in calculations.

AQA 物理 A Level 第二单元资料插页是考试中随卷提供的数据与公式小册子，涵盖力学、材料与波动。快速并准确地使用它可以节省时间、减少记忆错误，并在计算题中获得步骤分。

1. What the Insert Contains | 资料插页包含什么

The insert opens with fundamental constants and unit conversions relevant to the paper. It then groups equations by topic: motion, forces, energy, materials and waves. You are expected to select the correct equation without being told which one to use.

插页开头列有与试卷相关的基本常数和单位换算，然后按主题分组给出公式：运动、力、能量、材料和波动。题目不会提示你使用哪一条公式，因此你需要自行选择。

Do not treat the insert as a replacement for learning definitions. AQA questions often ask you to state the meaning of a symbol or explain the physical conditions under which an equation is valid.

不要将插页当作学习定义的替代品。AQA 题目经常要求你说明某个符号的含义，或解释某一公式成立的物理条件。

2. Fundamental Constants and Data | 基本常数与数据

Check the value of gravitational field strength before using it. The insert usually gives g = 9.81 N kg⁻¹ or m s⁻², and the speed of light c = 3.00 × 10⁸ m s⁻¹ where relevant to wave questions.

使用前请先核对重力场强度 g 的数值。插页通常给出 g = 9.81 N kg⁻¹ 或 m s⁻²，并在与波动相关的题目中给出光速 c = 3.00 × 10⁸ m s⁻¹。

Always convert prefixes such as cm, mm, km, g and cm² before substituting numbers. A common error is to use centimetres in equations that expect metres.

代入数值前，请务必换算掉 cm、mm、km、g 和 cm² 等单位前缀。常见错误是在公式要求使用米时仍使用厘米。

3. Mechanics: Motion Equations | 力学：运动公式

The four SUVAT equations apply only when acceleration is constant. List the known quantities before choosing an equation that avoids the missing quantity.

四条 SUVAT 公式仅在加速度恒定时成立。先列出已知量，

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