What is conservation of energy ?
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For the Love of Physics (Walter Lewin's Last Lecture) |
What is conservation of energy :
Conservation of energy is a principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant. The first kind of energy to be recognized was kinetic energy or energy of motion. In certain particle collisions, called elastic, the sum of the kinetic energy of the particles before the collision is equal to the sum of the kinetic energy of the particles after the collision.
The notion of energy was progressively widened to include other forms. The kinetic energy lost by a body slowing down as it travels upward against the force of gravity was regarded as being converted into potential energy, or stored energy, which in turn is converted back into kinetic energy as the body speeds up during its return to Earth. So the sum of the kinetic and the potential energy of, say, a satellite or a freely swinging pendulum is constant or nearly so.
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| conservation laws |
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You can watch this video, where professor Walter Lewin explains in his last lectures the laws of conservation energy:
Friction, however, slows down the most carefully constructed mechanisms, thereby dissipating their energy gradually. During the 1840s it was conclusively shown that the notion of energy could be extended to include the heat that friction generates. The truly conserved quantity is the sum of kinetic, potential, and thermal energy. This version of the conservation-of-energy principle, expressed in its most general form, is the first law of thermodynamics. The conception of energy continued to expand to include the energy of an electric current, energy stored in an electric or magnetic field, and energy in fuels and other chemicals.
With the advent of relativity physics (1905) by Einstein, mass was first recognized as equivalent to energy. The total energy of a system of high-speed particles includes not only their rest mass but also the very significant increase in their mass as a consequence of their high speed. After the discovery of relativity, the energy-conservation principle has alternatively been named the conservation of mass energy or the conservation of total energy.
When the principle seemed to fail, as it did when applied to the type of radioactivity called beta decay (spontaneous electron ejection from atomic nuclei), physicists accepted the existence of a new subatomic particle, the neutrino, that was supposed to carry off the missing energy rather than reject the conservation principle. Later, the neutrino was experimentally detected.
Energy conservation, however, is more than a general rule that persists in its validity. It can be shown to follow mathematically from the uniformity of time. If one moment were peculiarly different from any other moment, identical physical phenomena occurring at different moments would require different amounts of energy, so that energy would not be conserved.
