Energy in this universe exists in different forms like sound, heat, radiation, light, chemical etc. we will Explain the Law of Conservation of Energy in this section and give some Examples of the Law of Conservation of EnergyThe Law of the Conservation of Energy includes following thingsEnergy cannot be created or destroyed.
I like to share this The Law of Entropy
Energy can change its form from one to another.Energy of an isolated system is conserved and remains constant.Let us understand above points in detail. We cannot create or destroy energy. The energy present in the universe is constant and can never be destroyed. It might be the case that some part of the energy becomes useless or unavailable but the total energy. Here the terms useless and unavailable means that that energy cannot be used to do any work. Like the pollutant gases in the environment.
This unavailable energy is known as entropy. Also energy can transform from one form to another as we see in our daily life when water is boiled then heat energy is converted into the internal energy of water, when fan is turned on then electrical energy is changed to mechanical energy, when a ball is dropped its potential energy changes to kinetic energy.For any system the total energy of the system remains conserved and is constant.
This means that there will be no loss on the energy of the system and the sum of all the energies of the system will be a constant at any stage. Let’s understand this with an Example of the Law of Conservation of Energy consider an isolated system which contains a pot containing water over a burner which is running using a fuel. Initially burner is not running. At this point total energy will include internal energy of water, chemical energy of fuel etc. When the fuel is burnt its chemical energy is converted into heat which boils the water and now heat energy is converted into the increased internal energy of water.
The total energy of the system remains conserved.Let’s take other Law of Conservation of Energy ExamplesWhen a ball is dropped from a height, at the top it has potential energy and zero KE. When it moves downwards its height is reduced and velocity increases because of which KE increases and PE decreases. Just before collision with ground whole PE converts into KE as height is zero and velocity is maximum.So, total mechanical energy is conserved PE + KE = constant.