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8th Grade Chapter 5 Lesson 3
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8th Grade Chapter 5 Lesson 3

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8th Grade Chapter 5 Lesson 3 8th Grade Chapter 5 Lesson 3 Presentation Transcript

  • 8 th Grade Chapter 5 Lesson 3 Pgs. 199-205 For Student Use Only
  • Thermodynamics
    • Therme= heat
    • Dynamis= POWER
      • Thermodynamics= heat power
    • There are 2 laws of Thermodynamics
      • 1 st Law= Stated by Robert Van Mayer
      • 2 nd Law= Stated by Nicolas Carnot
  • Myths and Truths
    • People originally thought heat was an invisible and weightless fluid
    • Count Rumford (really, Benjamin Thompson) realized that heat was a form of mechanical motion
      • He was able to convince other scientists with simple experiments that proved his point
  • 1 st Law of Thermodynamics
    • Force (Energy) cannot be created or destroyed it will only change forms
    • Mechanical Equivalent of Heat-
      • Work can be converted into heat and vice versa
      • 778 ft-lbs = 1 BTU (or 252 calories of thermal energy)
  • 1 st Law of Thermodynamics
    • Joule Discovered:
      • W=fd
        • Work= force x distance
    • Joule Restated:
      • 1 st Law of Thermodynamics
        • Energy is indestructible ; it is converted into other forms
  • 1 st Law of Thermodynamics
    • Law of Conservation of Energy:
      • The total amount of energy in a system is constant
    • Movie Notes
      • The Three Laws of Thermodynamics AND Newton and Thermodynamics
  • 2 nd Law of Thermodynamics
    • Nicolas Carnot- was named founder of thermodynamics
      • Stated (simply) heat is transferred from higher to low temperature
  • 2 nd Law of Thermodynamics
    • Heat will not go from lower temperature to higher temperature and goes from less energy to greater disorder
    • This is called ENTROPY
  • 2 nd Law of Thermodynamics
    • Entropy:
      • This is the amount of disorder in a system
      • When things decay entropy is increased (disorder is increased)
      • Energy must be expended to do work so perpetual machines do not work
      • For every action there is a loss of energy and an increase in disorder
    • Movie Notes:
      • Myth Busters- Conservation of Energy
  • Entropy and the Universe
    • Universe is heading towards more disorder
    • Energy is constantly being used and running down