This lecture covers Newton's three laws of motion, including the concepts of inertia, force, and action-reaction pairs. It also delves into the fundamental forces in nature, such as gravity, electromagnetism, and the strong and weak nuclear forces, as well as their unification. The presentation explores the experimental verification of Newton's second law and the implications of small accelerations. Additionally, it discusses the differentiation of interactions in the early universe and the concept of super-unification. The lecture concludes with an overview of the forces in nature and the exchange particles involved in fundamental interactions.