Concepts of Physics
Chapters 21 & 22
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Updated 5.11.20

Friday, April 23

  • Fluids test
  • Read Chapter 21

Monday, April 26 – Short periods due to PSSA Testing

  • Difference between heat & temperature

Tuesday, April 27 – Short periods due to PSSA Testing

  • Basic thermometry (keep thermometer upright, discard thermometers with separated columns, put bulb in middle of sample)
  • Intro. to thermodynamics
  • Intro. to Heat Mixes Lab

Wednesday, April 28 – Short periods due to PSSA Testing

  • Heat Mixes: Part I lab
    • Keep your lab paper so we can discuss the results Tuesday. Class participation credit awarded for conducting experiment.

Thursday, April 29 – Short periods due to PSSA Testing

  • Compare temperature scales (°F, °C, K), absolute zero
  • Intro. to Heat Mixes: Part II lab

Friday, April 30

  • Heat Mixes: Part II lab
    • Keep your lab paper so we can discuss the results tomorrow. Class participation credit awarded for conducting experiment.

Monday, May 3

  • 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, May 4

  • Antifreeze in the Summer? lab

Wednesday, May 5 - see pictures shown in today's class

  • P. 322, 1-10 due
    • turn in assignment at the beginning of the period
  • 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

Thursay, May 6

  • Go over yesterday's problems
  • DVD Demos: disc 14 chapters 32 and 33

Friday, May 7

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

Monday, May 10 – No School – Break

Tuesday, May 11

  • Work on labs

Wednesday, May 12

  • 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
    • Heat rises myth
  • Radiation - infrared radiation. Works in a vacuum (this is how energy gets to us from the sun) or from a radiator. Demonstrate radiative heat gain and loss with colored cans. Does silver, white or black heat up and cool down the fastest?

Thursday, May 13 – Mr. Flint at Blood Drive

  • Linear Expansion of Metals lab due
  • Study for the test

Friday, May 14

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