I:\7th Grade\Energy\Heat Notes 2010


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I:\7th Grade\Energy\Heat Notes 2010

  1. 1. Warm up<br />Are fossil fuels renewable or nonrenewable?<br />Explain your answer to question 1.<br />What are some examples of fossil fuels?<br />
  2. 2. Guest Speaker…<br />Michelle Grossman, a meteorologist from NBC 10 news will visit our team on Friday.<br />We would like to send her some questions today so she knows what we are interested in.<br />Please write 3-5 questions you have on the index card at your table. <br />I will collect them and send our questions to Mrs. Grossman this afternoon.<br />
  3. 3. Heat<br />
  4. 4. Why does it seem like warm water is burning when you have just come in from being outside on a very cold winter day?<br />
  5. 5. The way we feel temperature is subjective; our hands/body are not good indicators of temperature!<br />
  6. 6. Which has a higher temperature? Which has more KE? TE? Heat?<br />Why?<br />
  7. 7. Thermal energy: depends on temp. AND amount the total energy of the particles<br />
  8. 8. Temperature:an average of KEso KE would be equal for both BUT, TE (overall KE) of the teapot would be largerWhy?<br />
  9. 9. Why does a stethoscope feel colder than a tongue depressor?<br />
  10. 10. Your back is heating the stethoscope!!<br />
  11. 11. Heat is a transfer of thermal energy between objects that are different temperatures;<br />Energy always moves from higher-temperature to lower-temperature<br />Heating stops when the objects are the same temperature<br />
  12. 12. Explain the energy transfer shown below:<br />
  13. 13. Misconception Alert<br />The thermal energy is related to temperature and state of matter. <br />So… equal masses of liquid water and steam at the same temperature (1000C) have different amounts of thermal energy. Why?<br />Steam stores energy used to separate the particles of liquid water, so steam has more thermal energy than liquid water.<br />
  14. 14. Is that a Fact<br />Special ceramic tiles were created for use on the underside of the space shuttle. These tiles transfer so little energy that one side can be exposed to a welder’s torch while the other side remains cool to the touch!<br />
  15. 15. Conductors<br />Conductors transfer thermal energy well<br />Curling iron<br />Iron skillet<br />Coils on stove<br />Copper pipes<br />Cookie sheet<br />
  16. 16. Demo….<br />*Observe the demonstration.<br />*Explain what happened.<br />Metals used:<br />1. Brass hub<br />2. Aluminum Rod<br />3. Brass Rod<br />4. Steel Rod<br />5. Nickel Rod<br />6. Copper Rod<br />3.<br />2.<br />4.<br />1.<br />5.<br />6.<br />
  17. 17. Insulators<br />Oven Mitt<br />Flannel PJ’s<br />Insulators transfer energy poorly<br />Plastic spatula<br />Ceramic bowl<br />Fiberglass<br />
  18. 18. How do these work?<br />
  19. 19. As the metals are heated, what happens to their particles?<br />Explain thermal expansion in relation to the experiment with the ring and ball.<br />
  20. 20. How does thermal expansion work in these?<br />Bimetallic strip:<br />Thermostat:<br />
  21. 21. DEMO…<br />Use what you know about the transfer of thermal energy to describe the demo…<br />
  22. 22. Convection<br />Transfer of thermal energy by the movement of liquid or gas<br />How exactly does this work?<br />Where can we see examples of this?<br />
  23. 23. DEMO…<br />Use what you know about the transfer of thermal energy to describe the demo…<br />
  24. 24. Radiation<br />Transfer of energy through matter or space as EM waves (ex: visible light, infrared, etc)<br />Where can we see examples of this?<br />
  25. 25. How do we measure temperature?<br />
  26. 26. 3 Scales:<br />Fahrenheit<br />Celsius<br />Kelvin<br />
  27. 27. What is absolute zero?<br />
  28. 28. Problems:<br />Use your textbook, page 153, to answer the following:<br />1. 24C to ?F<br />2. 17C to ?F<br />3. OC to ? F<br />4. 482F to ?C<br />5. -4F to ?C<br />6. 98.6F to ?C<br />
  29. 29. Readings:<br />Read the articles on pages 180-181 of your textbook.<br />Summarize one of them.<br />