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Energy and Energy Resources

What is energy?. Energy and Energy Resources. Energy and Work: Working Together. Energy - the ability to do work The unit for energy is Joule (J) – just like work. Kinetic Energy. Kinetic Energy- energy in motion All moving objects have kinetic energy Kinetic Energy = KE = mv 2 2.

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Energy and Energy Resources

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  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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