What is mechanics ? Give definitions of its sub branches.

Explanation

Mechanics : "The branch of physics which studies and deals with motion of object is called mechanics." OR "Kinematics and dynamics are combindly known as Mechanics".
The sub branches of mechanics are :
(1) Kinematics : The branch which describes the motion without its causes is known as kinematics.
(2) Dynamics : The branch which describes the motion with its causes is known as Dynamics