AS Physics Core Revision: Mechanics, Waves and Electricity | AS 物理核心复习：力学、波与电学

📚 AS Physics Core Revision: Mechanics, Waves and Electricity | AS 物理核心复习：力学、波与电学

This AS Physics revision guide brings together the core topics that most candidates meet early in the course. It focuses on mechanics, materials, electricity, waves and quantum phenomena, with clear definitions and the key equations you need to apply in the exam.

本 AS 物理复习指南汇总了大多数考生在课程前期接触的核心专题。它重点关注力学、材料、电学、波和量子现象，给出清晰的定义以及你在考试中需要应用的关键方程。

1. Units and Measurements | 单位与测量

AS Physics questions frequently test your ability to use SI base units and derived units correctly. The seven SI base units are the metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol) and candela (cd). Every other unit, such as the newton (N) or joule (J), can be expressed as a combination of these base units.

AS 物理试题经常考查你是否能正确使用 SI 基本单位和导出单位。七个 SI 基本单位是米 (m)、千克 (kg)、秒 (s)、安培 (A)、开尔文 (K)、摩尔 (mol) 和坎德拉 (cd)。其他所有单位，例如牛顿 (N) 或焦耳 (J)，都可以表示成这些基本单位的组合。

You should also be confident with standard prefixes such as nano (10⁻⁹), micro (10⁻⁶), milli (10⁻³), centi (10⁻²), kilo (10³), mega (10⁶) and giga (10⁹). Converting between prefixes is a basic skill, but many candidates lose marks by rushing through unit conversions before substituting values into formulas.

你还应该熟练使用标准前缀，例如纳 (10⁻⁹)、微 (10⁻⁶)、毫 (10⁻³)、厘 (10⁻²)、千 (10³)、兆 (10⁶) 和吉 (10⁹)。前缀之间的换算是基本技能，但许多考生在代入公式前匆忙进行单位换算，因而失分。

When reporting a measurement, pay attention to accuracy, precision, repeatability and resolution. Accuracy describes how close a result is to the true value, while precision describes how close repeated readings are to one another. Uncertainty and percentage uncertainty are also common exam topics.

报告测量结果时，要注意准确度、精密度、可重复性和分辨率。准确度描述结果与真实值的接近程度，而精密度描述重复读数彼此之间的接近程度。不确定度和百分不确定度也是常见考点。

Percentage uncertainty = (absolute uncertainty ÷ measured value) × 100%

2. Kinematics: Motion in a Straight Line | 运动学：直线运动

The four equations of motion apply only when acceleration is constant. You must choose the equation that

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