Heat Transfer Objectives 5.5.1, 5.5.2, and 5.5.3

1. Heat TransferObjectives 5.5.1, 5.5.2, and 5.5.3 Mr. Smet’s Scientific Studies

2. Do Now • Place your homework on the table in front of you. On a sheet of paper: • What are the three types of heat transfer and what are their definitions?

3. 3 types of heat transfer: • Conduction • Heat transfers through direct contact between particles. • Radiation • Heat transfers through waves. • Convection • Heat transfers through liquids and gases by moving particles.

4. Agenda • Do Now • Introduction • Review • Activity 1 • Activity 2 • Exit Slip • Closing

5. Today • Review • Activities • Exit Slip

6. Objectives 5.5.1 SWBAT define the three major heat energy transfers: Conduction, Convection, and Radiation. 5.5.2 SWBAT classify situations as one of the major heat energy transfers. 5.5.3 SWBAT illustrate the three major heat energy transfers.

7. Agenda • Do Now • Introduction • Review • Activity 1 • Activity 2 • Exit Slip • Closing

9. Conduction • Heat transfers through direct contact between particles. • This only happens when two objects are touching. • The heat energy moves from high (hotter temperatures) to low (colder temperatures).

10. Conduction • This is drawn as an arrow moving from the hotter object to the colder object.

12. Radiation • Heat transfers through waves. • This sends heat in all directions through waves. • When seen, radiation often looks like light. • Think: The sun!!!

13. Radiation • Radiation is drawn as a wave ending in an arrow in the direction of the movement of heat energy.

15. Convection • Heat transfers through liquids and gases by moving particles. • Hotliquids and gases move up while cold liquids and gases sink, creating a circle.

16. Convection • This is drawn as a circle with hot in one lower corner rising and cold in the opposite top corner sinking.

17. Checks for Understanding

18. Agenda • Do Now • Introduction • Review • Activity 1 • Activity 2 • Exit Slip • Closing

19. Activity 1Introduction Big Question: Which material (spoon, stick) in a cup of hot or cold water will melt the fastest?

20. Activity 1Materials • 2 Metal spoons • Timer • Plastic knife • ¼ inch margarine • 4 Thumbtacks • Wax paper • 2 Styrofoam Cups • Marker

21. Activity 1Procedure 1. With a Sharpie marker, label one Styrofoam cup hot and the other cup cold. 2. Place the 2 spoons and 2 popsicle sticks side-by-side on the wax paper. 3. Take the 1/4 inch slice of butter and place it on the wax paper, away from the spoons and popsicle sticks. 4. Take the plastic knife and cut the 1/4 inch square cold slice of butter into 4 equal parts.

22. Activity 1Procedure 5. Put the 4 equal parts of butter each on: • the end of the metal spoons • the end of the popsicle sticks 6. Place 1 spoon and 1 Popsicle stick into both of the Styrofoam cups. 7. Place a thumbtack into the center of each of the 4 pieces of butter.

23. Activity 1Procedure 8. Obtain 500 ml of hot water, as the teacher directs, and pour the hot water into the Styrofoam cup labeled hot. 9. At the same time, obtain 500 ml of cold water, as the teacher directs, and pour the cold water into the Styrofoam cup labeled cold.

24. Activity 1Procedure 10. Start the timer. Measure the time it takes for each thumbtack to fall from its spoon, knife or stirring rod, etc. There will be 4 readings to enter in a data table. (2 for hot, 2 for cold). The table is on the backside of this paper. 11. Touch the 4 materials and rate them as to which feels the coolest to hottest, after the thumbtack has fallen off. Write this on the backside of this paper

25. Activity 1Procedure When you have completed the activity, follow the Cleanup Procedureand begin working on the analysis questions on the backside of the page.

26. Activity 1Cleanup Procedure • Throw away the butter and wax paper • Pour the water into an empty sink in the back of the room. • Place the silverware into the container on the table in the back of the room. • Place the thumbtacks in the cup in the back of the room. • Neatly stack the Styrofoam cups on the back table.

27. Expectations • Follow all procedures the first time. • Do not play around with the equipment. • You should only be out of your seat when either: • Getting your equipment • Cleaning up from the activity • When completed, cleanup immediately and begin working on the analysis questions.

28. Agenda • Do Now • Introduction • Review • Activity 1 • Activity 2 • Exit Slip • Closing

29. Activity 2Introduction Big Question: Will the temperature of dirt be greater under a 40-watt light bulb or when not under a lamp?

30. Activity 2Materials • Soil • 2 Styrofoam bowls • 2 Thermometers • 1 lamp with 200-watt bulb • 1 Timer • 2 Manila Folders

31. Activity 2Procedure 1. Setup the manila folders like a “wall.” 2. Place one bowl on one side of the manila folders and one on the other. 3. Place one thermometer into each of the dirt piles so that the tip is just below the surface. You do not want it going all the way to the bottom.

32. Activity 2Procedure 4. Place the light so that it is shining directly onto one of the bowls of dirt. Do not yet turn it on. 5. Record the temperatures of both of the bowls on the other side of this page. Notice that there are four tables: 2 each for each of the bowls. Write the temperatures down under the correct light source (none or lamp) and correct cycle (heating cycle) under Start Temperature. Also, write down the time on the wall clock.

33. Activity 2Procedure 6. Turn on the lamp and start the timer. 7. For the next ten minutes, record the temperature of the dirt piles. Be sure that you record both bowls each minute and write down the temperature in the correct table.

34. Activity 2Procedure 8. After ten minutes, after you have written down the temperature under ten minutes for the Heating Cycle in both, turn off the lamp. 9. Immediately, write down the temperature under the Start Temp. For Cooling Cycle for both bowls. Also, write down the Start Time.

35. Activity 2Procedure 10. Restart the watch. 11. Again, write down the temperature of both piles of dirt each minute for the next ten minutes.

36. Activity 2Procedure When you have completed the activity, follow the Cleanup Procedureand begin working on the analysis questions on the backside of the page.

37. Activity 2Cleanup Procedure • When completed, remove the thermometer and place this in the cup on the rear table. • Walk to the trash and pour out the dirt from the bowls. • Place the bowls on the back table in a neat stack. • Wipe off and throw away and dirt remaining on the lab table. • Answer the analysis questions on the back of this paper.

38. Expectations • Follow all procedures the first time. • Do not play around with the equipment. • You should only be out of your seat when either: • Getting your equipment • Cleaning up from the activity • When completed, cleanup immediately and begin working on the analysis questions.

39. Agenda • Do Now • Introduction • Review • Activity 1 • Activity 2 • Exit Slip • Closing

40. Objectives 5.5.1 SWBAT define the three major heat energy transfers: Conduction, Convection, and Radiation. 5.5.2 SWBAT classify situations as one of the major heat energy transfers. 5.5.3 SWBAT illustrate the three major heat energy transfers.