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Energy and Energy Resources

This comprehensive overview of energy introduces concepts like kinetic, potential, and mechanical energy, along with relevant calculations. It explains key formulas, such as gravitational potential energy (GPE) and kinetic energy (KE), using practical examples like vehicles and objects at different heights. Further, it explores other forms of energy, including thermal, chemical, electrical, sound, light, and nuclear energy. The principles of energy conservation are highlighted, emphasizing that energy cannot be created or destroyed but can change forms, essential for understanding mechanics and thermodynamics.

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Energy and Energy Resources

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Presentation Transcript

  1. What is energy? Energy and Energy Resources

  2. Energy and Work: Working Together • Energy- the ability to do work • The unit for energy is Joule (J)– just like work.

  3. Kinetic Energy • Kinetic Energy- energy in motion • All moving objects have kinetic energy • Kinetic Energy = KE = mv2 2

  4. Kinetic Energy Calculations • What is the kinetic energy of a car that has a mass of 1,200 Kg and is moving at a speed of 20 m/s? KE= 1,200 x 20 x 20 ÷ 2 = _____________ • What is the kinetic energy of a car that has a mass of 2,400 kg and is moving at 20 m/s? How does this kinetic energy of the car in the above example compare? KE= 2,400 x 20 x 20 ÷ 2 = _____________

  5. Potential Energy • Potential Energy- The energy that an object has because of the position, shape, or condition of the object • Gravitational Potential Energy - energy stored as a result of position or height. • GPE = weight x height

  6. Potential Energy Calculations • What is the gravitational potential energy of a book with a weight of 13 N at a height of 1.5 m off the ground? GPE= 13 x 1.5 = _________________ • What is the gravitational potential energy of a cat that weighs 40 N standing on a table that is 0.8 m above the ground? GPE = 40 x 0.8 = ___________________

  7. Potential Energy Calculations • What is the gravitational potential energy of a diver that weights 500 N standing on a platform that is 10 m above the ground? GPE = 500 x 10 = _____________________

  8. Mechanical Energy • Mechanical Energy- the total energy of motion and position of an object. • Mechanical Energy (ME) = potential energy + kinetic energy (J) (J) (J)

  9. Calculating Mechanical Energy • What is the mechanical energy of a book being held in the air that has 100 J or potential energy and 50 J of kinetic energy? 100 + 50 = __________________ • What is the mechanical energy of a goose standing on a rock that has 75 J of potential energy and 60 J of kinetic energy? 75 + 60 = _______________

  10. Other Forms of Energy • Thermal Energy- is all of the kinetic energy due to motion of the particles • Chemical Energy-The energy in a compound that changes as its atoms are rearranged • Electrical Energy- is the energy of moving electrons.

  11. Others Forms of Energy • Sound Energy- is caused by an object’s vibrations. • Light Energy- Produced by the vibrations of electrically charged particles. • Nuclear Energy- The energy that comes from the nucleus of an atom

  12. Where Does Energy go?3: Conservation of Energy • Friction-A force that opposes motion between two surfaces that are touching

  13. Law of Conservation of Energy • Energy cannot be created or destroyed. • Energy changes forms.

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