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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
Middle school physics; High school biology. NEW. High school chemistry. NEW. High school physics. NEW. Hands-on science activities. NEW. AP®︎/College Biology; ... Up to 2nd grade (Khan Kids) 2nd grade; 3rd grade; 4th grade; 5th grade; 6th grade reading and vocab. NEW. 7th grade reading and vocab. NEW. 8th grade reading and vocab. NEW.
If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Here you'll review some of the basics of physics and chemistry, including mechanics, optics, electricity and magnetism, periodicity, and chemical equations, as you prepare to show your physical science prowess on the MCAT.
Interactive Sharpen your skills with our library of thousands of practice questions, videos, lessons, and hints plus test-taking tips and strategies. High Quality Prep for every section of the digital SAT with guidance from Khan Academy’s team of math, reading, and writing experts.
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Course: Middle school physics > Unit 1. Lesson 1: Representing motion. Introduction to Middle school physics. Units. Frames of reference.
Khan Academy has revamped its high school biology and physics courses to align with NGSS standards. These comprehensive courses feature new content, engaging activities, and real-world applications to inspire students and support teachers. Explore the wonders of science with Khan Academy.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. High school physics—NGSS (DEPRECATED) Course: High school physics—NGSS (DEPRECATED) > Unit 3. Lesson 1: Introduction to energy. What is energy?