The essence of continuum mechanics — the internal response of materials to external loading — is often obscured by the complex mathematics of its formulation. By building gradually from one-dimensional to two- and three-dimensional formulations, this book provides an accessible introduction to the fundamentals of solid and fluid mechanics, covering stress and strain and other key topics. This undergraduate text presents several real-world case studies, such as the St. Francis Dam, to illustrate the mathematical connections between solid and fluid mechanics. The emphasis is on practical applications of these concepts to mechanical, civil, and electrical engineering structures and design.