7.2

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?

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]

Key words

• Efficiency

• Joule (kilojoule)

• Conserved

• Dissipated

Energy efficient

Pendulum swing

V formation

Energy transfers

Energy efficiency

Energy cannot be created or destroyed, only changed

Worked example: light bulb

Energy dissipation

And finally…

• Write down 5 examples of energy transfers using …. -> …..

• How could the transfer be made more efficient?

Homework

Read the book!