Once you learn the math, the physics follows rather easily.
Newtonian, Hamiltonian and Lagrangian descriptions of motion.
The motion and deformation of engineering structures and machines.
Motion of materials modeled as a continuous mass rather than as discrete particles.
Specific constitutive modelling and applications to realistic problems.
Programming computers to analyze and solve scientific problems.
Studying assemblies of particles too large to be deterministically described.
Descriptions of the motions of objects at speeds comparable to the speed of light.
Looking at physical phenomena at microscopic scales, where the action is tiny.