Definition: Mechanics
Mechanics is a science that deals with the study of changes occurred in a body (stationary and moving) when subjected to external/internal forces.
The branch of mechanics that deals with bodies at rest is called statics while the branch that deals with bodies in motion is called dynamics.
The subcategory fluid mechanics is defined as the science that deals with the behavior of fluids at rest (fluid statics) or in motion (fluid dynamics), and the interaction of fluids with solids or other fluids at the boundaries.
The study of fluids at rest is called fluid statics. The study of f1uids in motion, where pressure forces are not considered, is called fluid kinematics and if the pressure forces are also considered for the fluids in motion that branch of science is called fluid dynamics.
