LAW OF CONSERVATION OF ENERGYEnergy, Work, and PowerCP-05 Page 6Rev. 0LAW OF CONSERVATION OF ENERGYEnergy does not simply appear and disappear. Energy is transferred from one positionto another or transformed from one type of energy to another.EO 1.4STATE the First Law of Thermodynamics, "Conservationof Energy."ConservationofEnergyThe First Law of Thermodynamics is simply stated "energy cannot be created or destroyed, onlyaltered in form." In the previous chapter, we discussed potential energy, where a force is appliedto an object, raising it from some point of origin to some height. The energy expended in raisingthe object is equivalent to the potential energy gained by the object because of its height. Thisis an example of a transfer of energy as well as an alteration of the type of energy. Anotherexample is throwing a baseball. While the ball is in your hand, it contains no kinetic energy.You apply a force to the ball by throwing it. The ball leaves your hand with a velocity, givingit kinetic energy equal to the work applied by your hand. Mathematically, this can be describedby the following simplified equation.Energy+ Energy- Energy= Energy(5-4)initialadded removedfinalwhere:Energyis energy initially stored in an object/substance. This energy can exist ininitialvarious combinations of kinetic energy and potential energy.Energyis energy added to the object/substance. Heat can be added. Energy can beaddedadded in the form of stored energy in any mass added, such as water to a fluid system.Work can be done on a system. Heat is energy gained or lost at a microscopic level.Work is the same at a macroscopic level.Energyis energy removed from an object/substance. Heat can be rejected. Workremovedcan be done by the system. This energy can be in the form of energy stored in any massremoved.Energyis energy remaining within the object/substance after all energy transfers andfinaltransformations occur. This energy can exist in various combinations of kinetic,potential, flow, and internal energy.
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