Classical mechanics
![Diagram of orbital motion of a satellite around the earth, showing perpendicular velocity and acceleration (force) vectors.](/Images/godic/202501/30/Orbital_motion3611.gif")
![The analysis of projectile motion is a part of classical mechanics.](/Images/godic/202501/30/Tir_parabòlic3611.png")
![Domain of validity for Classical Mechanics](/Images/godic/202501/30/Physicsdomains.svg3612.png")
![Three stage Theory of impetus according to Albert of Saxony.](/Images/godic/202501/30/Theory_of_impetus.svg3612.png")
In physics, classical mechanics and quantum mechanics are the two major sub-fields of mechanics. Classical mechanics is concerned with the set of physical laws describing the motion of bodies under the influence of a system of forces. The study of the motion of bodies is an ancient one, making classical mechanics one of the oldest and largest subjects in science, engineering and technology. It is also widely known as Newtonian mechanics.