Energy is a measure of the capacity of a physical system
If a given physical system has a certain amount more energy in some state X than the energy in state Y, it means that it is capable of performing work on other bodies. The value of this work is equal to the energy difference between these states if the internal energy remains constant.
Energy is a measure of the ability of a physical system (matter) to perform work or make heat flow. In processes in which one type of energy is converted into another (for example, during heating with a radiator, the energy of electric charges in the spiral can be converted into the internal energy of the air surrounding the spiral and the internal energy of the radiator itself), always associated with some kind of interaction (in the example given, this is the interaction of electrons with a crystalline The work of the forces describing these interactions is equal to the amount of energy converted.
energy flow
According to the accepted method of describing physical processes, energy in these processes can be transferred from one physical object (system) to another, and different forms of energy (forms) of energy correspond to different physical processes that can change (transform) in these processes into others.
The energy of an isolated system is constant, although its forms can change and can be transferred from one part of the system to another (the principle of conservation of energy ). According to Noether, the principle of conservation of energy stems from the symmetry of time translation (which can be interpreted as a property of the world according to which the laws of physics are the same today as yesterday).
Due to the principle of conservation of energy and the relationship of this principle with the symmetry of time translation, energy is one of the main physical quantities.
Energy in relativity.
In the special theory of relativity, the total relativistic energy of a given physical object is the time component of the four-pulse of this object.
According to the principle of mass and energy equivalence, which follows from the special theory of relativity, the rest mass of a given physical object is its rest energy (energy in the reference frame associated with the object, called the rest system of this object), determined by the formula and under certain conditions it can be converted into kinetic energy (and kinetic energy in rest), while the total relativistic energies of the individual parts of the system (measured in the frame of reference of the momentum of the system) are components of energy (mass) rest of the system.
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Energy is a measure of the ability of a physical system (matter) to perform work or make heat flow. In processes in which one type of energy is converted into another (for example, during heating with a radiator, the energy of electric charges in the spiral can be converted into the internal energy of the air surrounding the spiral and the internal energy of the radiator itself), always associated with some kind of interaction (in the example given, this is the interaction of electrons with a crystalline The work of the forces describing these interactions is equal to the amount of energy converted.
energy flow
According to the accepted method of describing physical processes, energy in these processes can be transferred from one physical object (system) to another, and different forms of energy (forms) of energy correspond to different physical processes that can change (transform) in these processes into others.
The energy of an isolated system is constant, although its forms can change and can be transferred from one part of the system to another (the principle of conservation of energy ). According to Noether, the principle of conservation of energy stems from the symmetry of time translation (which can be interpreted as a property of the world according to which the laws of physics are the same today as yesterday).
Due to the principle of conservation of energy and the relationship of this principle with the symmetry of time translation, energy is one of the main physical quantities.
Energy in relativity.
In the special theory of relativity, the total relativistic energy of a given physical object is the time component of the four-pulse of this object.
According to the principle of mass and energy equivalence, which follows from the special theory of relativity, the rest mass of a given physical object is its rest energy (energy in the reference frame associated with the object, called the rest system of this object), determined by the formula and under certain conditions it can be converted into kinetic energy (and kinetic energy in rest), while the total relativistic energies of the individual parts of the system (measured in the frame of reference of the momentum of the system) are components of energy (mass) rest of the system.
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