Transcript Energy
Energy Definition? – From Wikipedia • In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation",) is a scalar physical quantity that describes the amount of work that can be performed by a force. http://en.wikipedia.org/wiki/Energy What does scalar mean? – without direction. What is work? – The force required to move an object multiplied by the distance it is moved. Different forms of energy include: kinetic, potential, thermal, gravitational, sound, light, elastic, Electromagnetic, Chemical energy, Nuclear energy. • The forms of energy are often named after a related force. Kinetic Energy: • The energy of movement. http://digital-photography-school.com/wp-content/uploads/2007/08/movement-blur-1.jpg Potential energy The stored energy of position. http://www.solarpowerwindenergy.org/wp-content/uploads/2009/05/kineticandpotentialenergy.jpg http://www.greenscreen.org/articles_sr/energy/images_potential_kinetic_energy/potential_kinetic.jpg http://www.physicsclassroom.com/Class/energy/u5l1b1.gif Thermal / Heat energy http://www.physast.uga.edu/~rls/1020/ch4/fig4-4.jpg This is the energy in the molecules of a substance which move. More thermal energy means more molecule movement – so it is really Kinetic energy on a molecular scale! Gravitational Energy • This is a type of energy that an object has because of its mass. The bigger an object’s mass the greater its gravity. http://www.phys.unsw.edu.au/~cgt/cgt/Honours_Projects_files/shapeimage_2.jpg Sound energy • The energy carried in waves in the air. http://www.gobates.com/HM00050_.gif Light energy. • The energy carried in light waves. Nearly all life on this planet depends on this as its original energy source. http://farm1.static.flickr.com/75/227649503_88121cf734.jpg Electrical energy • The energy carried by moving charges. http://universalgeneral.com /db4/00336/universalgener al.com/_uimages/41k_Clou dLightening.jpg Elastic energy • A type of potential energy. http://www.bbc.co.uk/schools/gcsebitesize/science/images/energy_elastic.jpg Electromagnetic energy • Energy carried by electromagnetic waves. Light energy is one type of these energies. http://www.nasa.gov/centers/langley/images/content/114284main_EM_Spectrum500.jpg&imgrefurl=http://www.nasa.gov/centers/langley/science/FIRST_prt.htm &usg=__VVUKc2-ReBx_iG9MsP9R6VXr_7s=&h=317&w=500&sz=67&hl=en&start=6&um=1&tbnid=6VN-zkKvE3H3M:&tbnh=82&tbnw=130&prev=/images%3Fq%3Delectromagnetic%2Benergy%26ndsp%3D18%26hl%3Den%26lr%3D%26um%3D1 Chemical energy • The energy found in the bonds between atoms. http://www.chemistry.wustl.edu/~courses/genchem/LabTutorials/Cytochromes/images/fl owchart1.jpg Nuclear energy • The energy found within an atom. http://library.thinkquest.org/06aug/01200/Graphics/705px-Nuclear_fireball.jpg Law of Conservation of energy • Energy cannot be created or destroyed, it can just change from one type to another. • An energy changer is called a TRANSDUCER How does this apply to living things? http://en.wikipedia.org/wiki/File:Energy_and_life.png Think of a car. What energy changes take place in a car? http://www.foothill.edu/sustainability/smart-car.jpg What about this one? http://www.speedace.info/solar_cars/solar_car_images/auburn_univer sity_solar_car_banked_road_test.jpg