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A Macroscopic View and Engineering Practices

Engage in hands-on activities to understand energy transfer through the use of tiles and ice cubes. Predict, test, and observe temperature variations to enhance comprehension. Enhance critical thinking and teamwork skills.

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A Macroscopic View and Engineering Practices

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  1. Modeling Energy Transfer: A Macroscopic View and Engineering Practices

  2. STEP 1 Observations • Record some general observations of the tiles • Which tile feels warmer? TILE A TILE B • Make some predictions: a. Predict which tile has a higher temperature (if either one does) “I predict that Tile —- will have a higher temperature.” b. Predict the actual temperature of each tile Tile A: ____˚C Tile B: ____˚C

  3. Using the IR Thermometer DO NOT shine the laser any place other than the Melting Tiles and/or Ice Doing so will result in swift disciplinary action including: • A score of “0” on the lab activity • 2-day suspension from school • Now…how they work, let’s practice!

  4. STEP 2 Test Predictions • Flip the tiles over. Use the IR thermometer to test the temperature of each tile. Record the temperatures: TILE A: ______˚C TILE B: _______˚C • Did your prediction match the actual temperatures of each tile? YES NO What do you think temperature measures? “I think temperature measures…” • Try to explain your results by drawing a picture of each tile and writing your ideas about what may be happening. • Share your ideas with a partner.  Try to come to a consensus about your explanations.  Record any new ideas that support your initial explanation about what may be happening.

  5. STEP 3 Ice Melting Prediction • Suppose you were going to place an ice cube on each tile. • Based on your explanation in the previous step, predict which tile (A or B) will melt the ice cube faster, if either.  Describe your prediction.

  6. STEP 4 Ice Melting Observations • ONLY WHEN I TELL YOU… …place ONE ice cube on each tile. • Record your observations on your paper. • Put the ice cubes on NOW!!! • After 2 minutes, record the temperature of BOTH tiles.

  7. Individually Summarize Complete the table:

  8. STEP 5 Explanation • Share your ideas with the rest of the group • REMEMBER.. Everyone’s ideas are important if they make you THINK!

  9. Let’s Play a Game!! • Two teams… • Start with a container of marbles in the BACK of the room… • …and pass them, one-by-one, person-to-person to FRONT of the room. • The Rules: • Everyone has to handle the marbles, so determine your group’s path to the front (who is passing to you?...who are you passing to?) • Group A : Pass the marbles however you’d like! • Group B : Use your LEFT hand only, marbles handled between your middle and “ring” fingers.

  10. Let’s Play a Game!! • READY?!! • GO!!!

  11. Let’s Play a Game!! • So…who’s the winner? • At your tables, discuss why this group won…and the other group lost • Let’s expand our model… …using an “ice cube” • NOW…use your earlier discussion above (won/lost) to explain: • why one ice cube melted faster than the other • what do you think the marbles represent? • how does this explain why one block “feels” colder than the other?

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