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According to wikipedia, Mechanics (Greek Μηχανική) is the branch of physics concerned with the behavior of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. Mechanics has its root in ancient civilizations such as Roman Civilization, Egyptian civilization, etc.

It has been divided into two major disciplines— classical mechanics and quantum mechanics. Classical mechanics was invented by Isaac Newton to understand the laws of motion and quantum mechanics is a broad expansion of mechanics and uses classical mechanics as a part of its own. Quantum mechanics was developed in 20h century. Both have none contradiction or confliction but are used in specific situations accordingly. Quantum mechanics uses classical mechanics as a foundation and explains the solutions at molecular and atomic level while the classical mechanics is used to solve unanswered difficulties of quantum mechanics.

Mechanics studies the object by dividing them in three categories of rigid, non-rigid and semi-rigid and encompasses atoms, molecules, electrons, projectiles, spacecrafts, stars, planets, asteroids, solids, fluids including gases and parts of machinery. Both disciplines of mechanics have their own sub-branches.

Classical mechanics covers area of Acoustics, Applied mechanics or Engineering mechanics, Astrodynamics, Biomechanics, Biophysics, Celestial mechanics (the motion of heavenly bodies: planets, comets, stars, galaxies, etc.), Continuum mechanics, elasticity, Fluid mechanics, Fluid static, Fracture mechanics, Hamiltonian mechanics, Hydraulics, Lagrangian mechanics, Newtonian mechanics (kinematics and dynamics), Relativistic or Einsteinium mechanics and universal gravitation, Soil mechanics, Solid mechanics, sound, Static and Statistical mechanics. While the quantum mechanics studies remaining fields of mechanics such as condensed matter physics (study of quantum gases, solids, liquids, etc.), Nuclear physics, Particle physics, Quantum statistical mechanics, etc.

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