Heat Energy Part 2 Heat Transfer In our

Heat Energy Part 2

Heat Transfer In our environment, heat transfer always moves from the hotter object to the colder object. Heat and Thermal Energy link or by http: //www. mooreschools. com/cms/lib/OK 0 1000367/Centricity/Domain/63/6 th%20 Grade %20 Textbook/110 -114. pdf

Heat Transfer Heat transfers to and through some materials better than others There are 3 methods of heat transfer: Conduction Convection Radiation

What is conduction? What do you remember from watching Bill Nye? Here are some examples of conduction… http: //www. pbslearningmedia. org/resource /lsps 07. sci. phys. energy. heattransfer/

So, which spoon should I hold? I have a large pot of boiling spaghetti sauce I put 3 spoons in the pot: a wooden spoon, a metal spoon, and a plastic spoon Which spoon should I use to stir my pot of boiling sauce? Which spoon should I absolutely not hold? Why? Which spoon will be the hottest? Which is the coldest? Why?

Insulators Turn to page 7 in your book Have you ever roasted marshmallows? What did you place the marshmallow on to hold them over the fire? Why would a stick be better than a wire hanger? Why do some metal prongs have a wooden handle? Is it just for style or does it serve a purpose? Heat energy can move through many objects. An insulator is an object through which heat does not move easily. The molecules are far apart. Can you think of some examples: glass, wood, plastic, rubber, air, styrofoam

Conductors A conductor is an object through which heat moves easily. The molecules are close together. Can you think of some examples: Metal, (gold, silver, copper, aluminum), asphalt

Insulator movement I need 12 ish students… Stand up, spread out, and make sure you are not touching any person around you when you lift your arms out from your sides. You are representing molecules in an insulator. What characteristics do you have that an insulator has? You are far apart Now, I’m going to pick a volunteer from our insulator molecules and this person is going to be the “trigger. ” He/she will sway back and forth in one place. If the “trigger” touches someone, the someone will also sway back and forth in one place. We will do this for one minute to see how many “molecules” will affect another “molecule. ” In our books, page 7, draw a diagram of the “molecules. ” How many molecules are moving? Thank you molecules! Take a seat

Conductor movement Now I need 12 ish different students to be my “molecules” in a conductor. You guys will stand up, but this time I need you to form a block in one section of the classroom with everyone’s shoulders lightly touching. How are they like molecules in a conductor? They are very close together. Again, I’m going to pick a “trigger” student to set off a chain of events. This trigger student will sway, and if he/she touches another student, that student will sway, and so on… How long did it take for my trigger molecule to spread to the whole group? Let’s finish the diagram on page 7.

What happened with our insulators and conductors? Why did we do this? What did it show us? In our insulator group, the “molecules” were far apart, so the “heat” could not move easily from one area to the next (just like our trigger student couldn’t make contact with another student). Even if this went on for over an hour, we STILL would not have had everyone in the class moving. They were too far apart to make contact…much like the molecules in an insulator.

What happened with our conductors? Now, conductors, on the other hand, are very different. Since the molecules in a conductor are very close together, the heat moves very easily from one area to the next. We were able to get everyone in the conductor group moving within a very small amount of time. The heat is conducted from one area to the next very easily.

Back to roasting marshmallows… Why is a wooden stick a better idea than a wire hanger? Why do some metal hangers have a wooden handle?

Conduction 5 minute video clip https: //www. youtube. com/watch? v=Yitiw 6 Y 7 x. Zg Turn to page 8 in your books Heat transfer is the movement of heat from warmer to cooler objects. There are 3 methods of heat transfer. The first is conduction. Conduction is the transfer of heat by direct contact between molecules of a solid. What are some examples of conduction? Draw and label them in your book. Melting and ice cube in your hand, warmer a pot on the stove from the burner’s heat, spoon in a pot of boiling liquid, walking on hot asphalt, etc.

Convection 5 minute video clip https: //www. youtube. com/watch? v=Ife. Ra. Ob_E-s Turn to page 9 in your books Heat transfer is the movement of heat from warmer to cooler objects. There are 3 methods of heat transfer. The second is convection. Convection is the transfer of heat in liquids and gases through currents. Hot air always rises and cold air always falls. Why? When air is heated, the molecules begin to move faster and they take up more space. When the molecules begin to take up more space, the air becomes less dense. This makes the warmer air rise and the cooler air fall. This cycle is known as a convection current. Draw and label some examples…

Convection More examples to make sure your reeeeaaaaallllly get it http: //www. pbslearningmedia. org/resource/lsps 07. sci. phys. energy. heattransfer /heat-transfer/

Radiation 5 minute video clip https: //www. youtube. com/watch? v=Tgv. GC 0 y. Q 2 Dg Turn to page 10 in your books What are some things that give us heat? Write down some ideas. Heat transfer is the movement of heat from warmer to cooler objects. There are 3 methods of heat transfer. The third is radiation. Radiation is the transfer of heat through space in the form of waves. What are some examples? Sun warming the earth, fire, radiator, etc.

Radiation Another example to make sure your really REALLY get it http: //www. pbslearningmedia. org/resource/lsps 07. sci. phys. energy. heattransfer /heat-transfer/

Visual examples

Let’s Review https: //www. wisc-online. com/learn/natural-science/earthscience/sce 304/heat-transfer--conduction--convection--radiation