A force that acts on a body is equal to the product of mass on the acceleration, caused by this force (the 2- d law of Newton).

The bodies are acting on each other with forces that are even in the module and opposite in the direction (the 3- d law of Newton).

There are different types of forces in nature.

The forces of resiliency are caused by the forces of molecular interaction and prevent deformations of body at his compression and tension.

Bodies are attracted one to other with a force, the module of which is proportional to the product of their masses and inversely proportional to the square of distance between them (law of gravity).

Weight of body – is the force with which body are acting on support or suspension as a result of his attraction to Earth. The weight of body is a gravitation force.

The force of friction arises up at the touch of bodies and is directed along the surface of touch. The maximal force of friction is proportional to force of normal pressure.

The same force that acts during the same interval of time on two different bodies having the different mass causes a different change of velocity. At the collisions of bodies their velocities are changed considerably for the short interval of time. The deformation of bodies results in appearance of internal forces. Such interaction of bodies is characterized by instantaneous impulses.

The impulse of body is a physical value that is equal to the product of mass of body on his velocity.

The geometrical sum of impulses of bodies that make the closed system remains permanent at any motion and interaction of these bodies (law of saving of impulse).

The work of permanent force is equal to the product of the modules of vectors of force and a displacement on the cosine of angle between these vectors.

The energy of mechanical motion and interaction of bodies is named a mechanical energy. She is equal to the sum of Kinetic energy and Potential energy.

Kinetic energy is the measure of mechanical motion of body and is measured by work, which can be executed by a body at his braking to the complete stop. The work of forces is equal to the change of kinetic energy of body. Kinetic energy of body by mass of m that moves with a velocity v is equal to the work, which it is necessary to execute in order to add this velocity to the body.

Kinetic energy of material point is proportional to the mass of this point and to the square of velocity of his movement.

 Kinetic energy of body is equal to the sum of kinetic energies of all material points that enter to his composition.

If a body is revolved round an immobile point, his mechanical energy is proportional to the moment of inertia of body relatively to the axis of rotation and to the square of angular velocity.

In general case the mechanical energy of the system of material points is equal to the sum of kinetic energy of forward motion of its center of inertia and kinetic energy of the system at its relative motion.

Kinetic energy of body that moves forward and is simultaneously revolved with angular velocity around the axis that passes through the center of inertia of body is equal to the sum of kinetic energy of forward motion and kinetic energy of rotation.

The part of energy of the mechanical system that relies on system configuration, in other words, on the mutual disposing of particles of the system, and also on their disposing in the external power field is named Potential energy. She is measured by that work, which are executed by internal and external potential forces that act in transition from initial configuration to some zero configuration, for which the potential energy is equal a zero.

Potential energy of the body lifted on a certain height above a zero level is equal to the work of gravity force at falling of body from this height to a zero level.

A potential energy characterizes the power potential field.

Complete mechanical energy of the closed system of bodies remains unchanging at any motion of bodies of the system (the law of conservation of complete mechanical energy).

The system of bodies is named dissipative, if its mechanical energy through the certain interval of time diminishes due to the transformation into other unmechanical forms of energy, for example, into the internal energy of chaotic motion of particles (a dissipation of energy).

The power is a physical value that is equal to the relation of executable work toward the interval of time, for which she is executed.

The concepts and laws of classic Newton’s physics are universal for explication of contemporary bulk energy technologies and equipment but they can not be used directly to describe the quantum-electronic and molecular energy technologies and equipment where the laws of relativistic physics predominate.

By Vasil Sidorov on October 17, 2009 in Queltanews.com

sidorovvasil@gmail.com