📚 Year 7 OCR Science: Quick Formula & Theorem Handbook | 7年级OCR科学公式定理速查手册
Welcome to your Year 7 OCR Science quick reference! This handbook summarises key formulas and theorems you will meet in Physics, Chemistry and Biology. Use it to revise relationships, understand units and apply concepts to problems.
欢迎使用你的7年级OCR科学速查手册！本手册汇总了你在物理、化学和生物学科中会遇到的公式与定理。用它来复习各类关系、理解单位并将概念应用到题目中。
1. Speed, Distance and Time | 速度、距离与时间
Speed is a measure of how rapidly an object moves. It is a scalar quantity, which means it only has magnitude, not direction. The formula linking speed, distance and time is a cornerstone of kinematics.
速度是衡量物体运动快慢的物理量。它是一个标量，即只有大小没有方向。连接速度、距离和时间的公式是运动学的基础。
speed = distance ÷ time
速度 = 距离 ÷ 时间
In symbols, we often write v = s / t or v = d / t, where v is speed measured in metres per second (m/s), d is distance in metres (m) and t is time in seconds (s). Note that s can also be used for distance, but d is common.
符号表达中，我们常用 v = s / t 或 v = d / t
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