The physics archive contains legacy physics content, and is not being updated with new content. For our most up-to-date, mastery-enabled courses, check out Middle School Physics, High …

Physics is built on a foundation of math and it seeks to explain all phenomena in the universe. It forms the basis for other sciences like chemistry and biology. Physics uses simple yet elegant …

Aug 18, 2025 · Explore Khan Academy’s updated AP Physics 1 and NGSS-aligned Middle School Physics courses, featuring new videos, interactive practice, and hands-on activities to support …

Unit 1: Forces and Newton's laws of motion About this unit For our most up-to-date, mastery-enabled courses, check out High School Physics, AP Physics 1, and AP Physics 2!

物理学研究的是决定我们身处的物质世界的基本原理。我们将从运动自身开始。然后，我们将在许多不同的实际情况中了解力、动量、能量和其它概念。为了更好地理解物理学，你需要有牢固 …

Unit 2: 4th quarter: Physics Unit mastery: 0% Evolving models of the universe Universal Laws of Physics: From Aristotle to Newton's Laws Light as a wave and a particle Understanding the …

This course has been deprecated. We recommend exploring our improved High School Physics, AP Physics 1, and AP Physics 2 courses instead.

Learn physics using videos, articles, and NGSS-aligned practice exercises. Explore the fundamentals of motion and forces, non-contact interactions, energy, and waves.

In the physics sense, you are doing no work on the book. However, even if you don't have a book in your hand, if you twist side to side, your muscles get warm and you release energy.

Let's think about what physics is and what topics are covered in an introductory physics course.