# Mechanics

Mechanics is the branch of Physics responsible for the study of motion. There is Classical, Relativistic and Quantum Mechanics.

**Mechanics** is the branch of Physics responsible for the study of the movements of bodies, as well as their temporal evolution and the mathematical equations that determine them. It is an extremely important study, with countless everyday applications, such as in Geology, with the study of the movements of tectonic plates ; in Medicine, with the study of blood flow mapping; at Astronomi,a with the analysis of the movements of the planets etc.

The foundations for what we call Classical Mechanics were laid by Galileo Galilei , Johannes Kepler and Isaac Newton . In the 20th century Albert Einstein developed the studies of the so-called Relativistic Mechanics, a theory that encompasses Classical Mechanics and analyzes movements at speeds close to or equal to that of light. The so-called Quantum Mechanics is the study of the subatomic world, molecules, atoms, electrons, etc.

**→ Classical Mechanics**

Classical Mechanics is divided into Kinematics and Dynamics.

Kinematics is the **mathematical** study of motion. The causes that originate them are not analyzed, only their classifications and comparisons are made. Uniform motion , uniformly varied motion, and circular motion are themes of kinematics.

**→ Relativistic Mechanics**

Relativistic Mechanics shows that space and time at speeds close to or equal to that of light are not absolute concepts, but relative ones. According to this theory, different observers, one stationary and the other at high speed, present different perceptions of the measurements of space and time.

The Theory of Relativity is the work of the German physicist Albert Einstein and was published in 1905, the so-called miraculous year of Physics, as it was the year of the publication of Einstein’s precious scientific articles.

**→ Quantum Mechanics**

Classical Mechanics is a limiting case of Quantum Mechanics, but the language established by Quantum Mechanics is dependent on Classical Mechanics. In Quantum, the basic concept of trajectory (path taken by a mobile) does not exist, and measurements are made based on the interactions of electrons with objects called devices.

The concepts studied in Quantum Mechanics deeply affect our common sense and propose phenomena that may seem strange to us. As an example, we can cite the case of the position and velocity of an electron. In Classical Mechanics, the positions and velocities of a mobile are extremely well defined, but in Quantum, if the coordinates of an electron are known, the determination of its velocity is impossible. If the velocity is known, it becomes impossible to determine the position of the electron.