The diagram above explains the basic principle of the law of conservation of energy. It is the trajectory for the change of energy. Ignoring other factors like friction and heat loss, the total energy of a cart is the same although the value of kinetic energy and potential energy vary. At the starting point, the total energy is the same as the kinetic energy and as the cart progresses uphill, the kinetic energy decreases until it reaches zero at the highest point. The total energy at this point is equal to the potential energy. As the cart moves downward, the total energy can be viewed as the sum of the equal magnitude of kinetic and potential energy.
Thus, it is concluded that in an isolated system, the total energy of a system remains conserved. That is, energy can neither be created nor be annihilated. Energy can only be converted from one form to another form. In simpler language, when there is a loss in one type of energy, then there must be an increase in some other type of energy to keep the total energy of a system conserved. This law is universal and there is no violation of this law till the present time.
Energy can be classified into two types of energy namely potential energy (P.E.) and kinetic energy (K.E.).
Potential energy is referred to the energy that is stored in the static particles of a system. It is due to the virtue of position, which is the result of the gravitational pull of the earth.
The types of potential energy are as follows:
Chemical energy: It is the type of energy that is equipped in the bonds of atoms or molecules. This energy is released when a compound undergoes a chemical reaction. For example, the combustion of petroleum, propane, and coal release energy.
Nuclear energy: It is the type of energy that is stored in the nucleus of atoms that holds a nucleus together. This energy is released when the nucleus of a radioactive element undergoes radioactive decay. For example, uranium.
Gravitational energy: It is the energy that is stored due to place and position. For example, water stored in a reservoir has a great amount of stored energy.
Mechanical energy: It is the energy that is stored in the object by the application of force. Examples of stored mechanical energy are compressed springs and dart guns.
Kinetic energy is referred to the energy that is possessed by the moving particles.
Kinetic energy can be in various forms which are listed below,
Radiant energy: It is the energy that is possessed by electromagnetic radiation (EMW). EMW travels as transverse waves. For example, UV rays, X-rays, etc.
Thermal energy: It is the energy that is stored as internal energy in the substance. Thermal energy: It is related to heat. The molecules have a vibrational and rotational motion that is responsible for thermal energy.
Sound energy: It is the energy that is stored in longitudinal waves.
Electrical energy: It is the energy that is possessed by the movement of electrons.
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