Mechanics is the branch of physics that deals with the behavior of physical systems under the action of forces. It is concerned with the motion of objects, the forces that act on them, and the energy involved in their movement. Mechanics can be divided into two main branches: classical mechanics and quantum mechanics. Classical mechanics deals with the motion of macroscopic objects, while quantum mechanics deals with the behavior of subatomic particles. Mechanics plays a crucial role in understanding and predicting the motion of objects in the physical world, from the movement of planets in space to the behavior of atoms in a solid.