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11.1 What is Energy?

11.1 What is Energy?. Pages 350-355. 11.1 What is Energy?. Energy is the ability to do work or cause change. Energy makes things go! Work is the transfer of energy from one object to another. Energy and Work is measured in joules ( J ). 11.1 What is Energy?.

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11.1 What is Energy?

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  1. 11.1 What is Energy? Pages 350-355

  2. 11.1 What is Energy? • Energy is the ability to do work or cause change.Energy makes things go! • Work is the transfer of energy from one object to another. • Energy and Work is measured in joules (J).

  3. 11.1 What is Energy? • Power is the rate at which energy is transferred, or the amount of energy transferred in a unit of time. • Power = Work or Energy Transferred Time Time

  4. Which has more power?

  5. Which has more power?

  6. Which has more power?

  7. Which has more power?

  8. 11.1 What is Energy? • What are two types of energy? • Kinetic Energy and Potential Energy

  9. 11.1 What is Energy? • Kinetic energy is the energy an object has due to its motion. • Two factors that affect kinetic energy are:

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

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

  12. 11.1 What is Energy? • Kinetic energy is the energy an object has due to its motion. • Two factors that affect kinetic energy are: • Mass • Speed • Speed affects kinetic energy more than mass

  13. 11.1 What is Energy? • Potential energy is energy stored in an object due to its position, shape, or composition.

  14. Consider the following! • Which one has more stored energy? B A

  15. Consider the following! • Which one has more stored energy?

  16. Consider the following! • Which one has more stored energy?

  17. Consider the following! • Which one has more stored energy?

  18. Consider the following!

  19. 11.1 What is Energy? One form of potential energy is gravitational potential energy.

  20. 11.1 What is Energy? • Factors that affect gravitational potential energy are:

  21. WEIGHT HEIGHT WEIGHT

  22. 11.1 What is Energy? • Factors that affect gravitational potential energy are: • Height • Weight

  23. Review 1. What are the two main types of energy?

  24. Review • What are the two main types of energy? Answer: Kinetic Energy and Potential Energy

  25. Review 2. What is kinetic energy?

  26. Review 2. What is kinetic energy? Answer: Kinetic energy is the energy an object has due to its motion.

  27. Review 3. What is potential energy?

  28. Review 3. What is potential energy? Answer: Potential energy is the energy stored in an object due to its position, shape, or composition.

  29. Calculate KE KE = ½ x mass x speed x speed or KE = ½ x mass x speed2

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

  31. Calculate KE • A girl who has a mass of 60 kg is inline skating at a speed of 5 m/s. What is the girl’s kinetic energy?KE = ____________m = ____________ s = ____________

  32. Calculate KE • A girl who has a mass of 30 kg is inline skating at a speed of 10 m/s. What is the girl’s kinetic energy?KE = ____________m = ____________ s = ____________

  33. 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 = ____________

  34. 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 = ____________

  35. Calculate GPE GPE = weight x height

  36. 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 = ____________

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

  38. 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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