in education wise teachers tell their students that there is a conservation law in mechanics.Its meaning is that the energy in a closed system can not disappear forever, wasting to perform any work.In such processes there is no disappearance, and energy conversion of one species to another.For example: click the switch - and a bright light bulb flashes.Counter regularly considers watts of energy expended.Where did she go?It's simple: an electric current does the work, and the energy is converted into light and heat.In other words, conservation laws in mechanics are relevant for any mechanical device (or even electric - the only difference is the variety of the original energy and the title of the same phenomenon).In fact, the law of conservation is a fundamental principle, according to which the entire universe lives.
First of all, you must decide what is the kinetic and potential energy.Speaking simplistically, the first is the energy of motion of the body, describing the work done by the body.And the second is temporarily unrealized energy of the system, determines the nature of the interaction and the location of objects in the system.It is only natural that the term is derived from the Latin word meaning "opportunity."The mechanics of these two kinds of energy are converted into one another.
conservation laws in mechanics work as follows.For example, an object thrown up at the time of the pulse has a maximum value of the kinetic energy.Accordingly, its velocity is highest at the initial moment.Gradually, it decreases as the kinetic energy is converted into potential.As a result, the object decelerates and stops.This means that the entire initial stock of pulse energy has been transformed into potential energy and accumulated in the system.Further, due to the gravitational influence of the object begins to fall.The potential energy is converted back into kinetic energy.It is not difficult to guess that in the initial moment of movement speed is minimal, but gradually increases as it increases the value of the kinetic energy of the system.It is worth noting that in this case, although the effect of the magnetic field of the Earth (extra pulse), the total energy of the system remains unchanged.
To better understand the conservation laws in mechanics, it makes sense to turn to their own life experience.Surely, as a child, each dropping a metal substrate is small, but a massive ball or an ordinary ball.He bounced up and fell again.This was repeated until the movement is not stopped spontaneously.But what about the energy conservation law in mechanics?After all, the logic, the potential energy of the ball falling to be fully converted into kinetic energy, and vice versa.Almost "perpetual motion."Surely in this case, the conservation laws in mechanics are not met?In fact, in this situation, a system has an effect on the friction of air molecules and deformation of the internal surface of the ball.They "steal" their part of the energy, which is why the ball stops bouncing gradually (by the way, so in the framework of classical mechanics is impossible to create a perpetual motion machine).
universal law of conservation enables them not only in the calculation of interaction systems macrocosm, but also, in part, in a microcosm.No movement trajectory, no kind of forces acting on the system does not affect the result - the laws of conservation work!
