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编者：牛顿第一定律和惯性是《力和运动》一章的重点，应用惯性现象解释问题和分清相互作用力和平衡力是本章的难点．下面几篇文章能帮你理解什么是力？什么是运动？理解重点难点知识和相关的概念，为你顺利地突破难点助一臂之力．牛顿第一定律是《力和运动》一章的重点知识之
Editor’s Note: Newton’s first law and inertia are the focus of Chapter One of “Strength and Movement”. Applying inertial phenomena to explain problems and distinguish between interaction forces and balance forces is a difficult point in this chapter. The following articles can help you understand what is power? What is exercise? Understand important and difficult knowledge and related concepts to help you break through difficulties. Newton’s first law is the key knowledge in the chapter “Strength and Movement”