Mechanics - a large area of science, which is divided into sections: classical mechanics, relativistic mechanics and quantum mechanics.Tasks for mechanics solved in several steps: First, draw a diagram of the object facilities.Plans should reflect all of the physical characteristics of the system: speed, acceleration, time, distance, force application, etc.in vector form, i.e.clearly indicate what laws need to be used to determine the result.In the second step write down all the laws of motion for x denoting the missing amount.Solve this equation and the equation, add the dimension and you get the result.
In classical mechanics to determine the laws of motion of bodies used Newton's laws and the principle of relativity of Galileo, so it is also called Newton.This section, in turn, is divided into statics (th
e study of the equilibrium of bodies), kinematics (the study of the motion of bodies without consideration of reasons) and dynamics (the study of the motion of bodies).
Newton's laws allow us to write the equation of motion for any mechanical system, if you know the power of interaction.Number three: the law of inertia (conservation body speed), the law of motion and the law of the pair interaction.Galileo relativity principle is: the laws of mechanics do not depend on the choice of the inertial reference system, in other words, all the equations of mechanics are equally correct.Inertial reference frame shows the motion of a free body in the absence of external forces acting.
Relativistic mechanics using the laws of mechanics at speeds comparable to the speed of light.At speeds less than the speed of light, the problem reduces to classical mechanics , so the laws and equations used are the same as for the addition of that space and time are the same coordinate system, ie,body movement takes place in the four-dimensional space.
In quantum mechanics considered the laws of motion of quantum systems such as atoms, molecules, photons, called elementary particles.The basic equations and laws of quantum mechanics: the Schrödinger equation, the von Neumann equation, Lindblad equation, Heisenberg equation.
In addition, the mechanics includes some other theories: the theory of oscillations, elasticity theory, theory of stability, mechanics of liquids and gases.
Some of the most used mechanical systems: mass point, mathematical pendulum, physical pendulum is absolutely solid, deformable body.