📚 Forces and Motion | 力与运动
This revision guide covers the key ideas of forces and motion in the Edexcel IGCSE Science (Double Award) specification. It explains the quantities you must distinguish, the graphs you must interpret, Newton's three laws, and the most common calculations you will be asked to perform.
本复习指南涵盖 Edexcel IGCSE 科学（双奖）中力与运动的关键内容，帮助你区分必考物理量、读懂两种运动图像、掌握牛顿三大定律，并熟练完成最常见的计算题。
1. Distance, Displacement, Speed and Velocity | 距离、位移、速率与速度
Distance is a scalar quantity. It measures the total length of the path an object travels, and it has no direction. Displacement is a vector quantity. It measures the straight-line distance from the starting point to the finishing point, together with the direction of that line.
距离是标量，表示物体运动路径的总长度，没有方向。位移是矢量，表示从起点到终点的直线距离，并包含方向信息。
Speed is the distance travelled per unit time. It is a scalar quantity. Velocity is the displacement per unit time. It is a vector quantity.
速率是单位时间内通过的距离，属于标量；速度是单位时间内的位移，属于矢量。
speed = total distance ÷ total time | velocity = displacement ÷ timePublished by TutorHao | IGCSE Science Revision Series | aleveler.com
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