*Foundations of Mechanical Engineering* offers a comprehensive and rigorous introduction to the fundamental principles essential for aspiring engineers. Beginning with core concepts, this textbook systematically explores the intricacies of thermodynamics, providing a solid understanding of energy, heat, and work. Students will master the core principles of classical mechanics, delving into the laws governing force, motion, and equilibrium, alongside practical applications in elementary mechanics and machines. The book extends its coverage to vital areas such as fluid mechanics, examining the behavior of liquids and gases, and delves into kinematics engineering to analyze motion without considering forces. Crucially, it integrates broader theoretical underpinnings, including an introduction to the theory of quantum mechanics, alongside detailed coverage of kinetics mechanics and the overarching laws of mechanics and motion. This text equips learners with a robust theoretical framework and practical insights vital for advanced studies and professional practice.