Concepts of Physics
Chapters 21 & 22
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Updated 4.9.2008

Wednesday, March 26

  • Fluids test
  • Read Chapter 21

Thursday, March 27

  • Thermometry/difference between heat & temperature
  • Intro. to thermodynamics
  • Heat Mixes: Part I lab
    • Keep your lab paper so we can discuss the results Tuesday. Class participation credit awarded for conducting experiment.
    • Basic thermometry (keep thermometer upright, discard thermometers with separated columns, put bulb in middle of sample)

Friday, March 28

  • Heat Mixes: Part II lab
    • Keep your lab paper so we can discuss the results tomorrow. Class participation credit awarded for conducting experiment.
    • Compare temperature scales (°F, °C, K), absolute zero

Monday, March 31

  • Thermal equilibrium
    • Heat flows from warm things to cold things until the temperatures become the same.
  • Heat vs. temperature (aluminum foil in oven vs. steam)
    • Temperature measures velocity of molecules
    • Thermometers measure their own temperatures - they have to end up at equlibrium with their environment
    • Heat measures total thermal energy (calorie is amount of heat needed to raise 1 g of water by 1°C)
    • calorie vs Calorie
  • Discuss results of Heat Mixes labs
    • Specific heat capacity – rate of temperature change. Low heat capacity changes temperature quickly.
    • Q=mCdeltaT
    • C for water is 1 cal/g°C, brass is 0.09 cal/g°C, lead is 0.03 cal/g°C
    • Water's high specific heat - role in temperature near shore, perspiration, water cooling in car, water in HVAC
    • Low specifc heat of coals lets you walk on them. Low specific heat of air lets you put your hand in an oven.
  • Intro. to Antifreeze in the Summer? lab

Tuesday, April 2

  • Antifreeze in the Summer? lab

Wednesday, April 2 and Thursday, April 3 – No class due to PSSA testing

Friday, April 4

  • P. 322, 1-10 due
    • turn in assignment at the beginning of the period
  • *Mr. Flint out ill today - do alpha and lab intro today 0809
  • Expansion of metals
    • Bridge expansion joints, Concorde expansion, old school thermostats, suspension bridge cable stretching, can't get a metal lid off a glass jar? What about filling a gas tank all the way to the top?
    • Bimetallic strip: strip on handle, modern thermostats
    • Intro. to Linear Expansion of Metals lab

Tuesday, April 8

  • P. 337; 3–6, 12–15 due
  • Collect homework
  • Linear Expansion of Metals lab

Wednesday, April 9

  • Antifreeze in the Summer? lab due
  • Heat transfer
  • Conduction - physical contact necessary; best for solids and liquids (heat transfer for objects in contact) Different substances conduct heat better than others - metals better than nonmetals and it varies by substance - show color changing rod heat conduction demo. Air is a great insulator.
  • Convection - requires a moving fluid like a liquid or gas; wind, HVAC forced air systems
  • Radiation - infrared radiation. Works in a vacuum (this is how energy gets to us from the sun) or from a radiator.

Thursday, April 10

  • Heat rises myth.
  • Demonstrate radiative heat gain and loss with colored cans. Does silver, white or black heat up and cool down the fastest?
  • DVD Demos: disc 14 chapters 32 and 33
  • Review concepts in this unit

Friday, April 11

  • Chapters 21 & 22 test
  • Read Chapters 25 & 26

Monday, April 14

  • Linear Expansion of Metals lab due