7.2

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7.2

  1. 1. 7.2 Animals, models and energy 28 January 2015 Name a famous waterfall Where is it located? Which waterfall is the largest in the world? What is interesting about the temperature of water at the bottom of a waterfall?
  2. 2. Aims • Develop experimental design skills as well as data interrogation. [Level 5] • Look at examples of the energy transfers that take place in simple machines. [Level 5] • Use the idea that energy is conserved during transfers to explain that missing energy is dissipated energy. [Level 6] • Explain why it is advantageous for machines to be energy efficient. [Level 7]
  3. 3. Key words • Efficiency • Joule (kilojoule) • Conserved • Dissipated
  4. 4. Energy efficient
  5. 5. Pendulum swing
  6. 6. V formation
  7. 7. Energy transfers
  8. 8. Energy efficiency Energy cannot be created or destroyed, only changed
  9. 9. Worked example: light bulb
  10. 10. Energy dissipation
  11. 11. And finally… • Write down 5 examples of energy transfers using …. -> ….. • How could the transfer be made more efficient?
  12. 12. Homework Read the book!

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