Energy

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Energy, Forms of Energy, Conservation of Energy

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Energy

  1. 1. Energy Motasem Abushanap Defining Energy, its forms and Laws 11/2/2012
  2. 2. EnergyWhat is Energy? Energy is the ability to do work, and it is a scalar physical quantity. Energy can be transformed into another sort of energy. But it cannot becreated AND it cannot be destroyed. Energy has always existed in one formor another.What is The Energy Measuring Unit? The measuring unit of Energy is "joule" which named after an Englishscientist James Prescott Joule who lived from 1818 to 1889. He discoveredthat heat is a type of energy.Energy Forms: 1- Chemical energy. 2- Electrical energy. 3- Heat (thermal energy). 4- Light (radiant energy). 5- Mechanical energy. 6- Nuclear energy.Types of Energy Energy can be classified in two types: 1- Potential Energy (Stored Energy). 2- Kinetic Energy (Moving Energy).Conservation of Energy Equations: Energy cannot be created or destroyed, but it can be converted(transformed) from one form to another. For the idealized roller coaster, allenergy is conserved through conservative forces, such as gravity. As thetrain accelerates down the lift hill, potential energy is converted into kineticenergy. When the train ascends another hill, the kinetic energy is converted
  3. 3. into potential energy again. This is conservation of mechanical energy, and itcontinues throughout the entire ride. The total mechanical energy for thetrain is shown by the equation:E=K.E+P.E…………………………………………………………………1P.E=m.g.h…………………………………..…………………...…………2K.E=1/2(m.v2)……………………………………………..…..…………..3 By applying conservation of energy, and imagining that we have aninitial state and final state the equation became:Ei = Ef................................................................................................4K.Ei + P.Ei=K.Ef + P.Ef....................................................................5Where:E= Total Energy (Joule).P.E= Potential Energy (Joule).K.E=Kinetic Energy (Joule).m= Mass of the body or system (Kg).g= gravity acceleration (m/s2).h= height of the system (m).How do we Use Energy? 1- Energy is Light Light is one type of energy that we can have by converting electricityor chemical energy to light. 2- Energy is Heat Heat is another type of energy that we can have by convertingelectricity of chemical energy into heat, it is called also Thermal Energy andit has three Law, Called Thermodynamics Laws..
  4. 4. 3- Energy Makes Things Grow and Move Plants uses chemical energy and light to grow, fish in the sea convertschemical energy into kinetic energy so it can moves, Humans convertchemical energy inside the food so they can grow and move. 4- Energy Runs Machines Inside the machine there is a device called electrical motor, whose jobis to convert electricity into mechanical energy so the machine can run, or inan opposite way, a device called generator is responsible to convertmechanical energy into electricity. 5- Energy Doesn’t Disappear From the conservation of energy law, the amount of energy available inworld is a fixed amount that cannot be changed, neither by destroying it norcreating it, but it available in many forms that it can change it form from oneto other.References 1- The NEED Project P.O. Box 10101, Manassas, VA 20108 1.800.875.5029 www.NEED.org 2- http://www.energyquest.ca.gov/story/chapter01.html 3- http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/shawna_sastamoinen/Conservation.htm 4- http://en.wikipedia.org/wiki/Conservation_of_energy

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