Physics the study of matter, motion, energy, and force.

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

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 math to …

Nuclear physics Explore how nuclei can change and emit radiation through alpha, beta, and gamma decay. Interpret half-life as the time it takes for half of sample of a radioisotope to decay. Discover …

Learn how Bernoulli's equation describes the conservation of mechanical energy in ideal fluid flow. Explore consequences of Bernoulli's equation, including Torricelli's theorem.

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In AP Physics 2, you'll learn about thermodynamics, electricity and magnetism, light, and modern physics. To make sure you’re prepared with the fundamentals, we recommend completing high …

Welcome to AP®︎/College Physics 1! In AP Physics 1, you'll learn algebra-based classical mechanics. To make sure you’re prepared with the fundamentals, we recommend completing high school …

Let's solve some problems to better understand the behavior of forces that act on objects, and their effects on motion. In the process, we will clear some common misconceptions.

That is a valid method for solving that problem. I was never taught Khan Academy's method in example 2 in my AP Physics I class, so the steps you took are what I would've done for that problem.