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11.1 What is Energy 11.2 Conservation of Energy PAGES 350-361

11.1 What is Energy 11.2 Conservation of Energy PAGES 350-361. Review. What is energy ? The ability to do work or cause change. What are the two types of energy? Kinetic Potential. Review. What is kinetic energy ? The energy an object has due to its motion. What is potential energy ?

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11.1 What is Energy 11.2 Conservation of Energy PAGES 350-361

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  1. 11.1What is Energy11.2 Conservation of EnergyPAGES 350-361

  2. Review • What is energy? • The ability to do work or cause change. • What are the two types of energy? • Kinetic • Potential

  3. Review • What is kineticenergy? • The energy an object has due to its motion. • What is potentialenergy? • Energy that results from the position, shape or composition of an object.

  4. Review • What do we measure energy in? • Joules(J)?

  5. Work • Workis done on an object when energy is transferred to that object

  6. Power • Poweris the rate at which energy is transferred power = work (energy transferred) time

  7. Kinetic Energy • What factors affect kinetic energy? Think about this!

  8. What takes more energy to move? • Why? Table hasmore massRubik’s cubehas less mass

  9. Which vehicle do you think had more energy before it crashed? • Why? Less speed More speed

  10. Potential Energy • Elastic Potential Energy • The energy associated with an object that can be compressedor stretched.

  11. Kinetic Energy • What factors affect kinetic energy? • Mass • Speed

  12. Potential Energy • GravitationalPotentialEnergy • Energy related to an object’s height

  13. What factors affect the gravitationalpotentialenergy(GPE)?

  14. WEIGHT HEIGHT

  15. What factors affect the gravitationalpotentialenergy(GPE)? • Weight • Height

  16. Review • What is mechanicalenergy? • The total of kineticenergyand potentialenergyof an object.

  17. Review • What is kineticenergy? • The energy an object has due to its motion. • What factors affect kineticenergy? • Mass • Speed

  18. Review • What is potentialenergy? • Energy that results from the position, shape or composition of an object. • What factors affect gravitationalpotentialenergy (GPE)? • Weight • Height

  19. Review • What do we measure energyin? • Joules(J)

  20. Energy Transformation • A change of energy from one form to another

  21. Calculating Mechanical Energy • ME = KE + PE

  22. 22 J 22 J

  23. Skate Park Simulation • energy-skate-park_en.jar

  24. Law of Conservation of Energy • Energy cannot be created or destroyed. It can only be transformed between kinetic and potential energy.

  25. Calculating Kinetic Energy

  26. Calculate KE • A girl who weighs 30 kg is inline skating at a speed of 5 m/s. What is the girl’s kinetic energy?KE = ____________m = ____________ s = ____________

  27. Calculate KE • Rodger Maris swung a bat which had a mass of 2 kg at a speed of 45 m/s. How many joules of kinetic energy could he give to a ball? KE = ____________m = ____________ s = ____________

  28. Calculate KE • Barry Bonds swings a bat which has a mass of 1.5 kg at a speed of 55 m/s. How many joules of kinetic energy could he give to a ball?KE = ____________m = ____________ s = ____________

  29. Calculating GPE • Factors are weightand height • GPE = magh • gravitational potential energy = weight x height

  30. Calculate GPE • Wile E. Coyote carries a 1,000 N anvil to the top of a 100 m cliff, sets it on the edge and waits to push it off when he hears Roadrunner say, “Beep beep!” What is the gravitational potential energy of the anvil as it sets on the edge of the cliff? GPE = ____________weight = ____________ height = ____________

  31. Calculate GPE • Wile E. Coyote weighs 300 N. What is his GPE on that same cliff? GPE = ____________weight = ____________ height = __100 m____

  32. Calculate GPE • Roadrunner weighs 50 N. Roadrunner is at the bottom of the cliff about to pass by Wile E. Coyote. What is the GPE of Roadrunner? GPE = ____________weight = ____________ height = ____________

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