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Energy

Energy. Mr. Skirbst Physical Science Topic 07. What is energy?. What is energy?. It is the ability to do work or cause change (remember: work = force x distance) Unit of energy = Joule. 5 FORMS of Energy. 5 FORMS of Energy. Mechanical - “matter in motion”

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Energy

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  1. Energy Mr. Skirbst Physical Science Topic 07

  2. What is energy?

  3. What is energy? • It is the ability to do work or cause change (remember: work = force x distance) Unit of energy = Joule

  4. 5 FORMS of Energy

  5. 5 FORMS of Energy • Mechanical - “matter in motion” - (ex. ball, bike, run, blood)

  6. 5 FORMS of Energy 2. Heat - “atomic motion” - (ex. melting, evaporation)

  7. 5 FORMS of Energy 3. Chemical - “atomic bonding” - (ex. burning, reactions)

  8. 5 FORMS of Energy 4. Electromagnetic - “moving electrons” - (ex. electricity, lights, motors)

  9. 5 FORMS of Energy 5. Nuclear - “fusion / fission” - (ex. stars, atomic bomb)

  10. 2 STATES of Energy

  11. 2 STATES of Energy • Kinetic (Greek – “kinetikos” motion) - energy of motion

  12. 2 STATES of Energy * depends upon mass & velocity K.E. = (mv2) / 2 m = mass; v = velocity

  13. 2 STATES of Energy 2. Potential - energy of position * stored energy (ex. food, fuel, suspended objects)

  14. 2 STATES of Energy “The bigger they are, the harder they fall” P.E. = mgh m = mass; g = gravity; h = height

  15. Energy Conversions Energy can be transferred from one object to another & from one form to another

  16. Example Problems m = 2 kg; v = 2 m/sec

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