Explore Newton's 1st and 2nd laws of motion in this 19-minute video lecture designed for introductory astronomy students. Delve into concepts such as constant velocity, forces, and their definitions, while examining the contributions of Galileo and Newton to our understanding of motion. Learn how to create and interpret freebody diagrams, and see these principles applied through practical examples. The lecture incorporates slides from Adams and Francis of Montana State University, providing a comprehensive foundation for understanding fundamental physics concepts in astronomy. For a complete understanding of Newton's laws, be sure to watch the follow-up video covering the 3rd law of motion.