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energy notes 5-6

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  1. 1. May 6- May 22ENERGY
  2. 2.  Energy- The ability to do work Kinetic Energy- The energy of motion Potential Energy- Energy stored as a result of position or shape Gravitational Potential Energy- Potential energy that dependson an object’s height above a reference point Elastic Potential Energy- The potential energy of an object thatis stretched or compressed Mechanical energy- Energy associated with the motion andposition of everyday objects Thermal Energy- The total potential and kinetic energy relatedto the motion of all particles in an object Chemical Energy- The energy stored in chemical bonds Electromagnetic Energy- a form of energy consisting ofchanging electric and magnetic fields Nuclear Energy- The energy stored in the nuclei of atomsWHAT IS ENERGY?
  3. 3.  In 1845, James Prescott Joule published results from a seriesof well constructed experiments and concluded three “laws ofthermodynamics” The 1st law of Thermodynamics- Energy cannot be created ordestroyed When we observe an energy transformation, all amounts of energymust be accounted for The 2nd law of Thermodynamics- Energy flows from highconcentration to low concentration. (Always from hot objectsto cold objects. When we observe an energy transformation, energy is always “lost”due to things like friction, sound, and heat The 3rd law of Thermodynamics- All objects contain someamount of thermal energy measured on the Kelvin Scale.Zero degrees Kelvin cannot ever be reached. All objects have thermal energy that can be measured and accountedforTHERMODYNAMICS
  4. 4. It is important to recognize our perception of energytransformation vs. reality of energy transformation. Example, touch your table top with one hand and the metalbar with the other hand. Which surface is colder? Both surfaces are the same temperature, why does one FEEL colder? You rub your hands together and they get warm? You eat a good breakfast before you take your final exams? You start your car and drive to the store? You flip on the lights when you walk into class? You create a camp fire to roast marshmallows? The alternator in your car uses the movement of your car’sengine to charge the battery?ENERGY TRANSFORMATION
  5. 5. HALF PIPE SCIENCEKinetic Energy =Potential Energy =
  6. 6. HALF PIPE SCIENCEKinetic Energy =Potential Energy =
  7. 7. HALF PIPE SCIENCEKinetic Energy =Potential Energy =
  8. 8. HALF PIPE SCIENCEKinetic Energy =Potential Energy =
  9. 9. HALF PIPE SCIENCEKinetic Energy =Potential Energy =