1. Energy Transformation & Conservation

2. Learning Target
I will describe how different forms of energy are transferred into other forms.

3. Think-Pair-Share
What happens to your hands when you rub them together?
What are other ways you can get warm?

4. Guided Reading Preview the red headings.
Write a how or what question for each heading.
As you read, write answers to your questions.
Ex. Q:What is energy transformation?
A: Energy transformation is ….

5. Forms of Energy Thermal Radiant (electromagnetic) Sound Chemical
Electrical
Mechanical

6. Energy Transformation
Energy transformation – a change of one form of energy to another form.
Some are single transformations & others are a chain of transformations

7. Original Energy Transformation
Most energy transformations can be traced back to the sun: the original source of energy for life on earth.

8. Simple Energy Transformation
Sunlight (electromagnetic energy) shines on a person's face and changes to thermal energy.
Why this happens:
As your skin absorbs energy the molecules move faster which produces heat.

9. Think-Pair-Share
What happens to the chemical energy in the food you eat?
Transformed to thermal energy & mechanical energy

10. Single Transformations
Sound energy can be transferred to your eardrum as kinetic energy (movement energy).

11. Single Transformations
Chemical energy stored in it is transferred to its surroundings as:
thermal energy
sound energy
kinetic energy.

12. Multiple Transformations
The battery transfers stored chemical energy as electrical energy.
The electrical energy is transferred to the surroundings by the lamp as light energy and thermal energy.

13. Multiple Transformations Example
Old style steam locomotive In this old steam engine, steam is used to move pistons, which make the wheels turn.
Radiant Chemical Thermal Mechanical

14. How It Works: Radiant energy from the sun is absorbed by plants.
Plants produce chemical energy through photosynthesis.
The plants die and become fossil fuels (chemical energy).
In the locomotive the chemical energy is burned (thermal energy).
The steam created from the thermal energy turns the wheels to make the locomotive move. (mechanical energy)

15. Conservation of Energy
Law of conservation of energy - energy cannot be created nor destroyed. It can only be transferred or transformed.

16. Think-Pair-Share
What form of energy is mechanical energy most often transformed?
thermal energy

17. Energy and Friction
Friction causing kinetic energy to transform into thermal energy.
Ex. The top has friction with the air and the ground causing its kinetic energy to transform into thermal energy.

18. Energy and Matter
Einstein’s theory of relativity: energy can be created by destroying matter.
Matter – anything that has mass and takes up space.
*All objects are made of matter!

19. Practice
Battery–powered alarm clock In this battery-powered alarm clock, the hands move and an alarm rings when it’s time to wake up.
Chemical      Electrical      Mechanical      Sound

20. Practice
Solar-powered car Most cars run by using a battery for electrical energy and gasoline for chemical energy. A solar powered car runs using only energy from the sun.                                          
Radiant    Electrical   Mechanical

21. Practice

22. Practice

23. Practice

24. Practice

25. Practice

26. Practice
What energy transformations take place inside a working battery?

27. Practice
Mechanical and Thermal Energy
(Don’t forget friction)

28. Assignment Complete Part 5 on the purple worksheet.
Complete the following exit slip:

29. Exit Slip
Energy cannot be created or destroyed. It can only be transformed from one form to another.
Identify all the energy transformations that occur when you operate a hair dryer.

30. Exit Slip Revealed Transformations: Electrical Thermal (heat coils)
Mechanical (fan)
Have student fill in the blank