1. Thank you for not chewing gum 
January 30th, 2015
Materials: Pencil, science notebook, Energy Transfers
Today’s Agenda:
Bell work
How THERMAL ENERGY is transferred
Learning Target: Today we will learn how THERMAL energy is transferred.
Daily Question: What is Thermal Energy? Give three examples

2. First a Review

3. Identify the following forms of energy…

4. Mechanical

5. Gravitational
(potential energy)

6. Electrical

7. Light (Radiant)
Electromagnetic

8. Thermal

9. Sound

10. Chemical

11. Nuclear

12. 1st Law of Thermodynamics
Also known as the Law of Energy Conservation…
ENERGY CAN NEVER BE CREATED OR DESTROYED, ONLY STORED OR TRANSFERRED.

13. ENERGY Concept 3: Transfer of Energy
Understand that energy can be stored and transferred.
PO 1. Identify various ways in which electrical energy is generated using renewable and nonrenewable resources (e.g., wind, dams, fossil fuels, nuclear reactions).
PO 2. Identify several ways in which energy may be stored.
PO 3. Compare the following ways in which energy may be transformed:
• mechanical to electrical
• electrical to thermal
PO 4. Explain how thermal energy (heat energy) can be transferred by:
• conduction
• convection
• radiation

14. Learning Goal: Students will be able to analyze ways in which our world uses renewable and nonrenewable energy resources and explain how energy is stored and transferred, giving specific, real-world examples of each.
Score 4.0
In addition to a 3, I can explain the importance of energy conservation and give examples of what I can do in my own life to save energy.
Score 3.0
I can analyze ways in which our world uses renewable and nonrenewable energy resources and explain how energy is stored and transferred, giving specific, real-world
Score 2.0
I can analyze ways in which our world uses renewable and nonrenewable energy resources and explain how energy is stored and transferred.
Score 1.0
With help from my peers or teacher, I can analyze ways in which our world uses renewable and nonrenewable energy resources and explain how energy
Score 0.0
I do not understand renewable and nonrenewable energy resources or how energy is stored and transferred.

15. Lets take a short break
And watch a Bill Nye clip

16. Transfer of Energy (E)

17. Energy Transfer
Energy is transferred from hotter object to colder object
Examples- Write down a couple
Cooking pasta
Making ice
Making popcorn
Roasting marshmallows

18. Conduction Transfer E as heat between particles in DIRECT CONTACT
Example
Roasting marshmallow with wire
Air molecules collide with wire
Transfer energy to wire
Particles in wire move faster, have more E
E then transfers to hand, detect warmth

19. Conduction Stir your hot soup with a metal spoon
Soon you need a pot holder because the end of the spoon you are holding gets hot
This is heat transfer by conduction
Energy travels up the spoon from the end in the hot soup to the end in your hand

20. Conduction
For example: a spoon in a cup of hot soup becomes warmer because the heat from the soup is conducted along the spoon.
Fun fact: Have you ever noticed that metals tend to feel cold? Believe it or not, they are not colder! They only feel colder because they conduct heat away from your hand. You perceive the heat leaving your hand as cold.

21. Conduction Example Put your hand on the desk. Popcorn in a pot
How does it feel?
Is it colder or is the heat transferring to your hand through CONDUCTION?
Popcorn in a pot
The heat is transferred by direct contact from the pan, to the oil, to the kernels of popcorn.

22. Conduction

23. Convection
Energy transfer through movement of fluids at different temperatures (fluids - liquids and gases)
Examples:
Camp fire
See soot, embers rise & swirl
Rise upwards – warm air expands
Why?

24. Convection
Convection current – flow of fluid due to heated expansion followed by cooling and contraction
Examples
Wind current
Boil water in pot

25. Convection
You can hold your fingers beside the candle flame without harm, but not above the flame. Why?

26. Convection Examples Water…boiling Hot air popcorn What is happening?
The hot air transfers the heat to the cooler kernels, and when enough hot air heats the kernels they pop.

27. Convection

28. Convection- Draw an example
Explains why breezes come from the ocean in the day and from the land at night