Physics uses simple yet elegant math to describe complex phenomena, from galaxies to biological systems. It's about understanding and predicting the universe's complexity based on simple ideas.

Oops. Something went wrong. Please try again. Uh oh, it looks like we ran into an error. You need to refresh. If this problem persists, tell us.

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

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 School Physics, …

Unit 8: Lego robotics Introduction Light guitar Coin detector Ant bot Programming basics

It is often "said" that Physics is all around us. This course aims to "show" you precisely that. We uncover electromagnetism by looking at things around us and answering the hows, whys, and whats to many …

Test your knowledge of the skills in this course. Start Course challenge

If you’ve mastered this content and want to explore physics at the next level, we recommend our AP Physics 1 and AP Physics 2 courses. Give us feedback on this course

We will create our first mental models for these basic electrical quantities. We will also talk about power, which is what happens when voltage and current act together.

Transverse and longitudinal waves are two types of mechanical waves, which involve the transfer of energy through a medium (e.g. water, air, a solid). Learn about transverse and longitudinal waves …