📚 Free Online Material for IB Physics | 免费在线IB物理学习材料
The IB Physics curriculum demands both deep conceptual understanding and strong problem-solving skills. Many students find that accessing high-quality study materials can be expensive, but the internet now offers a wealth of free resources. This article compiles the best free online simulations, video lectures, interactive exercises, and revision notes aligned with the Cambridge IB Physics syllabus. Using these materials consistently can transform your learning and boost your exam performance.
IB物理课程既需要深刻的概念理解，也需要扎实的解题能力。许多学生发现获取高质量学习资料成本高昂，但如今互联网提供了丰富的免费资源。本文整理了与剑桥IB物理教学大纲相符的最佳免费在线模拟、视频讲座、互动练习和复习笔记。坚持使用这些材料可以改变你的学习方式，提升考试成绩。
The resources covered here are ideal for both Standard Level (SL) and Higher Level (HL) students. They can help you visualise abstract phenomena, practise problem-solving, and even prepare for your Internal Assessment (IA). All you need is a computer or tablet and a curious mind.
这里涵盖的资源对标准水平（SL）和高级水平（HL）学生都适用。它们可以帮助你可视化抽象现象、练习解题，甚至为内部评估（IA）做好准备。你所需要的只是一台电脑或平板电脑，以及一颗好奇心。
| Resource | Type | Key Physics Topics |
|---|---|---|
| PhET Interactive Simulations | Simulation | Kinematics, Forces, Energy, Waves, Circuits, Quantum |
| Khan Academy | Video lessons + exercises | Full IB physics syllabus coverage |
| Isaac Physics | Problem-solving platform | Mechanics, fields, circuits, thermal |
| The Physics Classroom | Tutorial + interactives | Motion, forces, momentum, waves |
| OpenStax College Physics | Free textbook PDF | Comprehensive theory and examples |
| oPhysics | Interactive diagrams | Optics, waves, mechanics |
| 资源名称 | 类型 | 主要物理主题 |
|---|---|---|
| PhET 交互模拟 | 模拟 | 运动学、力、能量、波、电路、量子 |
| 可汗学院 | 视频课 + 练习 | 覆盖全部IB物理大纲 |
| Isaac Physics | 解题平台 | 力学、场、电路、热学 |
| The Physics Classroom | 教程 + 互动 | 运动、力、动量、波 |
| OpenStax 大学物理 | 免费 PDF 教材 | 全面理论与例题 |
| oPhysics | 交互图表 | 光学、波、力学 |
1. Kinematics: Bringing Motion Graphs to Life | 运动学：让运动图像活起来
Understanding the relationship between displacement, velocity, and acceleration is the bedrock of mechanics. The PhET 'Moving Man' simulation allows you to drag a character left or right and instantly see the resulting position–time, velocity–time, and acceleration–time graphs. This direct manipulation helps you internalise the meaning of slopes and areas under curves.
理解位移、速度和加速度之间的关系是力学的基石。PhET 的 "移动的人" 模拟让你左右拖动一个人物，并立即看到位移–时间、速度–时间和加速度–时间图像。这种直接操作帮助你内化斜率与曲线下面积的含义。
Pair this simulation with the Khan Academy kinematics playlist, which explains the four suvat equations step by step. After watching, practise using the free problem sets on Isaac Physics, where you can enter answers and receive instant feedback. Attempt to derive the equations yourself through graph analysis.
将此模拟与可汗学院运动学播放列表配合使用，后者逐步解释四个匀变速运动方程。观看后，使用 Isaac Physics 上的免费题目集进行练习，你可以输入答案并获得即时反馈。尝试通过图像分析自行推导这些方程。
v = u + at s = ut + ½at² v² = u² + 2as s = ½(u + v)t
For projectile motion, PhET's 'Projectile Motion' sim lets you launch objects at different angles and initial speeds, with vectors overlaid. Combine this with video analyses from Flipping Physics, where real-life demonstrations are broken down frame by frame.
对于抛体运动，PhET 的 "抛体运动" 模拟允许你以不同角度和初速度发射物体，并叠加矢量显示。结合 Flipping Physics 的视频分析，其中的真实演示被逐帧分解。
2. Mechanics: Mastering Free-Body Diagrams and Newton's Laws | 力学：掌握自由体图与牛顿定律
Free-body diagrams are the language of forces. The Physics Classroom website offers an interactive 'Free-Body Diagram' practice tool that immediately indicates whether your drawn forces are correct in type and direction. Insert this into your revision routine until you can sketch diagrams for any scenario.
自由体图是表示力的语言。The Physics Classroom 网站提供了一个交互式的 "自由体图" 练习工具，可以立即提示你所画的力在类型和方向上是否正确。将其融入你的复习计划，直到你能为任何情景画出草图。
To connect forces with motion, use the PhET 'Forces and Motion: Basics' simulation. Drag objects, apply forces, and witness how net force determines acceleration in accordance with Newton' law, F = ma. The vector display clarifies the balance between applied force and friction.
为了将力与运动联系起来，使用 PhET 的 "力与运动：基础" 模拟。拖拽物体、施加力，并观察合外力如何根据牛顿第二定律 F = ma 决定加速度。矢量显示清晰地展示了外力与摩擦力之间的平衡。
Inclined planes, pulleys, and tension problems often cause confusion. The oPhysics website contains pre-built interactive diagrams for these systems. You can drag masses, alter angles, and see real-time changes in normal force and tension. Always attempt to solve the problem on paper before using the simulator to check your reasoning.
斜面、滑轮和张力问题经常引起困惑。oPhysics 网站包含针对这些系统的预置交互图表。你可以拖拽质量块、改变角度，并实时看到法向力和张力的变化。在使用模拟器检查推理之前，始终先在纸上尝试解题。
3. Energy, Work, and Power: Visualising Energy Transformation | 能量、功与功率：可视化能量转换
The conservation of energy is a unifying principle in physics. PhET's 'Energy Skate Park' energy (Eₖ = ½mv²). You can also add friction to see how thermal energy drains the system.
能量守恒是物理学的一条统一原理。PhET 的 "能量滑板公园" 模拟让你设计带有回环和坡道的轨道，并观察滑板者如何在重力势能（Eₚ = mgh）和动能（Eₖ = ½mv²）之间转换。你还可以加入摩擦，观察热能如何消耗系统能量。
For work and power calculations, the OpenStax College Physics textbook (available as a free PDF) offers clear derivations and numerous worked examples. Download the section on 'Work, Energy, and Energy Resources' and work through the end-of-chapter problems. The solutions are available via the student solutions manual (also free).
对于功和功率的计算，OpenStax 大学物理教材（可获取免费 PDF）提供了清晰的推导和大量解题示例。下载 "功、能与能源" 章节并完成章末习题。解答可通过学生习题解答手册（同样免费）获得。
A common IA topic is an investigation into the efficiency of a bouncing ball. Use PhET simulations alongside video tracking software such as Tracker (free) to collect data and analyse energy loss.
一个常见的 IA 主题是研究弹跳球的效率。使用 PhET 模拟配合免费的 Tracker 视频分析软件来收集数据并分析能量损失。
4. Circular Motion and Gravitation: Building Your Own Solar System | 圆周运动与引力：建造自己的太阳系
acceleration (a = v²/r) and the forces that provide it can seem counterintuitive. The PhET 'Ladybug Revolution' eration. Change the angular velocity and observe how the centripetal acceleration changes.
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