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Energy Transformations & Conservation

Energy Transformations & Conservation. Chapter 13 Section 3. How are different forms of energy related?????. MOST FORMS OF ENERGY CAN BE TRANSFORMED INTO OTHER FORMS The change from one form to another is called – ENERGY TRANSFORMATION. Examples.

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Energy Transformations & Conservation

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  1. Energy Transformations & Conservation Chapter 13 Section 3

  2. How are different forms of energy related????? • MOST FORMS OF ENERGY CAN BE TRANSFORMED INTO OTHER FORMS • The change from one form to another is called – ENERGY TRANSFORMATION.

  3. Examples • A Toaster - Electrical Energy (EE) transforms to Thermal Energy (TE) EE  TE 

  4. ANOTHER EXAMPLE • Your body – Chemical Energy (CE) in the food we eat to Mechanical Energy (ME) to move the muscles and to (TE) to maintain your body temperature. CE ME TE  

  5. Forms of energy (new slide) • Potential energy • 1. elastic • 2. gravitational • 3. chemical Kinetic Energy -1.Mechanical 2. Thermal 3. Electric 4. Sound 5. Light

  6. Most Common TransformationPE to KE • Stretching a rubber band …. you give it PE When you let it go…. it flies across the room …. a moving rubber band = KE

  7. Law of Conservation of Energy • Energy can not be CREATED or DESTROYED it only changes FORM. • TOTAL ENERGY IS SAME BEFORE AND AFTER TRANSFORMATIONS.

  8. What about Friction?? • When an object encounters FRICTION – (surface and/or air) …. some KE to TE • A top spinning on the floor has Mechanical Energy (ME)  Thermal Energy (TE) It eventually falls down (runs out of energy) cause by the friction of the air and the surface. • This is why no machine can be 100% efficient!

  9. Adjustment to the Conservation Law • Albert Einstein said, “Matter and Energy can sometimes be transformed back and forth.” BUT MATTER AND ENERGY TOGETHER ARE ALWAYS CONSERVED.

  10. WHAT IS MATTER?? • ANYTHING THAT HAS BOTH…. • MASS And • VOLUME – Takes up Space

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