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Energy

Energy. LIGASE Elementary School Physics. Table of Contents. Energy Types & Conversions. Electricity. Light. Magnetism. Sound. PE & KE. Heat. ENERGY. Definition: the ability to cause a change. Types of Energy. Heat - the motion of molecules

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Energy

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  1. Energy LIGASE Elementary School Physics

  2. Table of Contents Energy Types & Conversions Electricity Light Magnetism Sound PE & KE Heat

  3. ENERGY • Definition: the ability to cause a change.

  4. Types of Energy • Heat - the motion of molecules • Mechanical - motion of objects • Sound - vibration • Chemical - chemical reactions • Light - visible and invisible waves • Electrical - electricity & magnetism

  5. Conservation of Energy • Definition: energy cannot be created nor destroyed, but can be transferred from one form to another.

  6. Energy Transfers • One form of energy can turn into another form. For example: • A ball thrown against the wall represents mechanical energy. The ball does not bounce back at the same speed, in part, because some of the mechanical energy is converted to sound and heat

  7. Energy Transfer Activities • Bring in different toys and household items that illustrate multiple energy transfers. Have students identify each energy in the toy/item. • Most energy that is “wasted” in an energy transfer is converted to heat.

  8. Energy Transfer Activities • Batteries (chemical) • Electricity (electrical) • Motor turns (mechanical) • Motor makes noise (sound) • Motor gets warm (heat) • Wheels turn (mechanical) • Friction on the floor (heat)

  9. Energy Transfer Activities Jack-in-the-Box Now you identify the energy transfers.

  10. Energy Transfer Activities Wind-up Mouse Identify the energy transfers.

  11. Energy Transfer Activities Wind-up Mouse Identify the energy transfers.

  12. Energy Transfer Activities Wind-up Mouse Identify the energy transfers.

  13. Energy Transfer Activities • Have students make “Rube Goldberg” drawings illustrating multiple energy transfers. Each drawing should include a number of tasks leading up to a final goal (ex. making toast).

  14. Energy Transfer Activities

  15. Potential Energy • The energy stored in an object.

  16. 100 kg 10 m Gravitational Potential Energy • The stored energy of position. • Weight (N) = mass (kg) x gravity (9.8 m/sec/sec) • 100 kg x 9.8 m/sec2 = 980 N • GPE = weight x height • 980 N x 10 m = 9,800

  17. 100 kg Average Velocity5 m/sec Kinetic Energy • The energy of motion. • KE = (m x v2) / 2 • (100 x 52) / 2 = 1,250

  18. Pendulum Potential Kinetic

  19. Pendulum Potential Kinetic

  20. Pendulum Potential Kinetic

  21. Pendulum Potential Kinetic

  22. Pendulum Potential Kinetic

  23. Pendulum Potential Kinetic

  24. Pendulum Potential Kinetic

  25. PE KE 100% PE 50% PE 50% KE 100% KE

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