Year 9 AQA Science: Formula & Theorem Quick Reference Guide | Year 9 AQA 科学：公式定理速查手册

📚 Year 9 AQA Science: Formula & Theorem Quick Reference Guide | Year 9 AQA 科学：公式定理速查手册

This bilingual quick reference guide covers essential formulas and theorems for Year 9 AQA Science, including physics equations for motion, forces, energy, electricity, waves, and key biology and chemistry principles. Each formula is presented with clear explanations, units, and worked examples to help you master the fundamentals.

这本双语速查手册涵盖了 Year 9 AQA 科学的核心公式和定理，包括运动、力、能量、电学、波等物理方程，以及重要的生物和化学原理。每个公式都附有清晰的解释、单位和示例，帮助你掌握基础。

1. Speed, Distance and Time | 速度、距离与时间

Speed is a measure of how fast an object moves. It is calculated by dividing the distance travelled by the time taken.

速度是衡量物体运动快慢的物理量，它等于物体运动的距离除以所用时间。

v = d / t

where v is speed (m/s), d is distance (m), and t is time (s).

其中 v 是速度(米/秒)，d 是距离(米)，t 是时间(秒)。

For example, if a car travels 100 metres in 5 seconds, its speed is v = 100 / 5 = 20 m/s.

例如，如果一辆汽车在5秒内行驶了100米，其速度为 v = 100 / 5 = 20 米/秒。

You can rearrange the formula to find distance: d = v × t, or time: t = d / v.

你可以变换公式来求距离：d = v × t，或时间：t = d / v。

2. Acceleration | 加速度

Acceleration tells us how quickly the velocity of an object changes. It is the rate of change of velocity.

加速度表示物体速度变化的快慢，是速度的变化率。

a = (v – u) / t

where a is acceleration (m/s²), v is final velocity (

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