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Chapter 15

Chapter 15. Energy. Energy and Work. Energy : The ability to do work. Work. The transfer of energy as the result of motion. (Unit of Work is the Joule ). Work = Force x distance W = F x d. Joule (J). Unit of Energy and Work. W = F • d Joule = Newton • meter J = (kg • m/s²) • m.

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Chapter 15

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  1. Chapter 15 Energy

  2. Energy and Work Energy: The ability to do work.

  3. Work The transfer of energy as the result of motion. (Unit of Work is the Joule) Work = Force x distance W = F x d

  4. Joule (J) Unit of Energy and Work. W = F • d Joule = Newton • meter J = (kg • m/s²) • m

  5. Kinetic Energy (KE) Energy that appears in the form of motion.

  6. Kinetic Energy (KE) m KE = ½ mv2

  7. A 70.0-kilogram daemon is walking at a speed of 2.0 m/s. What is his kinetic energy?

  8. Given: m = 70.0kg v = 2 m/s Find: KE = ? Equation: KE = ½ mv2 Solve: KE = ½ (70.0kg)(2 m/s)2 KE = 140J

  9. Potential Energy (PE) Energy that an object has as the result of its position or condition.

  10. Gravitational Potential Energy (GPE) An object's gravitational potential energy depends on its mass, its height, and the acceleration due to gravity.

  11. m h PE = mgh m = mass h = height g = acceleration due to gravity(9.8m/s2)

  12. Suppose the diver at the top of a 10.0-meter-high diving platform has a mass of 50.0 kilograms.

  13. Given: m = 50.0 kg h = 10 m g = 9.8 m/s2 Find: GPE = ? Equation: GPE = mgh Solve: GPE = (50.0kg)(9.8 m/s2)(10m) GPE = 4900J

  14. Elastic Potential Energy The potential energy of an object that is stretched or compressed.

  15. Forms of Energy The major forms of energy are mechanical energy, thermal energy, chemical energy, electrical energy, electromagnetic energy, and nuclear energy.

  16. Mechanical Energy Kinetic Energy and Potential Energy ME = KE + PE

  17. Thermal Energy The total potential and kinetic energy of all the microscopic particles in an object

  18. Chemical Energy The energy stored in chemical bonds.

  19. Electrical Energy Energy associated with electric charges.

  20. Electromagnetic Energy Form of energy that travels through space in the form of waves.

  21. Nuclear Energy The energy stored in atomic nuclei.

  22. Nuclear Fission

  23. NuclearFusion

  24. NuclearFusion

  25. Homework Math PracticePage 448, Probs:1-3 Section 15.1 WorksheetDue: 4/29/10

  26. Law of Conservation of Energy Energy: • Can change from one form to another. • Can never be created or destroyed. • Total energy of the universe remains the same.

  27. Mechanical Energy = Potential Energy + Kinetic Energy E = PE + KE KE = 0 PE = max KE = 0 PE = max KE = max PE = 0

  28. Pole Vault Kinetic Energy

  29. ElasticPotential Energy

  30. Kinetic Energy

  31. Gravitational Potential Energy

  32. E - Energy m - mass c – speed of light

  33. PE Work KE + PE KE + PE

  34. Homework 15-2 Section 15-2 Worksheet Due: 4/7/09

  35. Nonrenewable Energy A source of energy that exists in limited quantities and, once used, cannot be replaced except over the course of millions of years.

  36. Nonrenewable Energy Nonrenewable energy resources include oil, natural gas, coal, and uranium

  37. Renewable Energy A source of energy that can be replaced in a relatively short period of time.

  38. Renewable Energy Renewable energy resources include hydroelectric, solar, geothermal, wind, biomass, and, possibly in the future, nuclear fusion.

  39. Hydroelectric

  40. Solar

  41. Geothermal

  42. Wind

  43. Biomass

  44. Homework 15-3 Section 15-3Worksheet D: Due: 4/8/09

  45. Homework 15-3 Section 15-3Worksheet D: Due: 4/8/09 F: Due: 4/7/07 D Test: 4/9/08 F Test: 4/11/08

  46. Homework 15 -3 Section 15-3 Word-wise/Math Worksheets Due: 5/5/10 D Test: 5/6/10 E Test: 5/7/10

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