Uniformly Accelerated Rectilinear Motion Formulas (Part 1) | 匀加速直线运动公式（一）

📚 Uniformly Accelerated Rectilinear Motion Formulas (Part 1) | 匀加速直线运动公式（一）

In A-Level Mathematics, the study of kinematics often begins with uniformly accelerated rectilinear motion. This article introduces the essential formulas known collectively as the SUVAT equations, which model an object moving in a straight line with constant acceleration. We will explain each equation, derive them graphically, and show how to apply them with confidence.

在A-Level数学中，运动学的学习通常从匀加速直线运动开始。本文将介绍统称为SUVAT方程的基本公式，这些公式描述物体在恒定加速度下沿直线运动的情况。我们将解释每一个公式，通过图像推导它们，并展示如何自信地应用它们。

1. Defining Uniformly Accelerated Rectilinear Motion | 定义匀加速直线运动

Uniformly accelerated rectilinear motion occurs when an object moves along a fixed straight line and its acceleration remains constant in both magnitude and direction. As a result, the velocity changes by the same amount in every equal interval of time. This idealised model is a fundamental building block of mechanics and is frequently tested at A-Level.

匀加速直线运动是指物体沿固定直线运动，且加速度的大小和方向始终保持不变。因此，在相等的间隔时间内，速度的变化量相同。这种理想化模型是力学的基础模块，也是A-Level考试中的常考内容。

In practice, many real-world situations, such as a car accelerating along a straight road with constant engine power, can be approximated as uniform acceleration over short distances. Even when resistance forces exist, the SUVAT equations remain a powerful first approximation.

在实际中，许多真实情况，例如汽车以恒定发动机功率沿直道加速，在短距离内可以近似为匀加速运动。即使存在阻力，SUVAT方程仍然是一种有效的一级近似工具。

2. Notation and Units | 符号与单位

The five variables used in the SUVAT equations are: displacement s (metres

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