This lecture covers the fundamental concepts of gravitational forces, focusing on orbital mechanics, including Kepler's laws, moment of inertia, circular and curvilinear motion, and the demonstration of the gravitational force. It also explores the energy aspects of gravitational systems, such as potential and kinetic energies, and the transfer of orbits using Hohmann transfer. The lecture concludes with an overview of the main types of satellite orbits, including Low Earth Orbit (LEO), Medium Earth Orbit (MEO), and Geostationary Orbit (GEO).