This chapter presents a concise review of the undergraduate mechanics of materials including the direct constructions of the one-dimensional theories for extension of rods, torsion of circular shafts, and the Euler-Bernoulli theory for bending of beams. What is a little more general than the undergraduate mechanics of materials is that the one-dimensional theories are generalized from statics to dynamics. The propagation of extensional, torsional and flexural waves are discussed.