Download - 7.2
![Page 1: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/1.jpg)
7.2 Animals, models and energy8 April 2023
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?
![Page 2: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/2.jpg)
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]
![Page 3: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/3.jpg)
Key words
• Efficiency
• Joule (kilojoule)
• Conserved
• Dissipated
![Page 4: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/4.jpg)
Energy efficient
![Page 5: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/5.jpg)
Pendulum swing
![Page 6: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/6.jpg)
V formation
![Page 7: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/7.jpg)
Energy transfers
![Page 8: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/8.jpg)
Energy efficiency
Energy cannot be created or destroyed, only changed
![Page 9: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/9.jpg)
Worked example: light bulb
![Page 10: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/10.jpg)
Energy dissipation
![Page 11: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/11.jpg)
![Page 12: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/12.jpg)
![Page 13: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/13.jpg)
![Page 14: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/14.jpg)
And finally…
• Write down 5 examples of energy transfers using …. -> …..
• How could the transfer be made more efficient?
![Page 15: 7.2](https://reader036.vdocuments.net/reader036/viewer/2022062613/54555b9faf7959a0278b6a52/html5/thumbnails/15.jpg)
Homework
Read the book!