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. 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. Key words
• Efficiency
• Joule (kilojoule)
• Conserved
• Dissipated

4. Energy efficient

5. Pendulum swing

6. V formation

7. Energy transfers

8. Energy efficiency
Energy cannot be created or
destroyed, only changed

9. Worked example: light bulb

10. Energy dissipation

14. And finally…
• Write down 5 examples of energy
transfers using …. -> …..
• How could the transfer be made more
efficient?

15. Homework
Read the book!