Gravity for astronauts in orbit, Centripetal force and gravitation, Physics

Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

Why do astronauts appear weightless despite being near the Earth?