Mechanics is mainly divided in to two parts Static's and Dynamics, Dynamics further divided in kinematics and kinetics
Statics: It deals with the study of behavior of a body at rest under the action of various forces, which are in equilibrium.
Dynamics: Dynamics is concerned with the study of object in motion
Kinematics: It deals with the motion of the body with out considering the forces acting on it.
Kinetics: It deals with the motion of the body considering the forces acting on it.