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8th Grade Chapter 5 Lesson 3

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8th Grade Chapter 5 Lesson 3

1. 1. 8 th Grade Chapter 5 Lesson 3 Pgs. 199-205 For Student Use Only
2. 2. Thermodynamics <ul><li>Therme= heat </li></ul><ul><li>Dynamis= POWER </li></ul><ul><ul><li>Thermodynamics= heat power </li></ul></ul><ul><li>There are 2 laws of Thermodynamics </li></ul><ul><ul><li>1 st Law= Stated by Robert Van Mayer </li></ul></ul><ul><ul><li>2 nd Law= Stated by Nicolas Carnot </li></ul></ul>
3. 3. Myths and Truths <ul><li>People originally thought heat was an invisible and weightless fluid </li></ul><ul><li>Count Rumford (really, Benjamin Thompson) realized that heat was a form of mechanical motion </li></ul><ul><ul><li>He was able to convince other scientists with simple experiments that proved his point </li></ul></ul>
4. 4. 1 st Law of Thermodynamics <ul><li>Force (Energy) cannot be created or destroyed it will only change forms </li></ul><ul><li>Mechanical Equivalent of Heat- </li></ul><ul><ul><li>Work can be converted into heat and vice versa </li></ul></ul><ul><ul><li>778 ft-lbs = 1 BTU (or 252 calories of thermal energy) </li></ul></ul>
5. 5. 1 st Law of Thermodynamics <ul><li>Joule Discovered: </li></ul><ul><ul><li>W=fd </li></ul></ul><ul><ul><ul><li>Work= force x distance </li></ul></ul></ul><ul><li>Joule Restated: </li></ul><ul><ul><li>1 st Law of Thermodynamics </li></ul></ul><ul><ul><ul><li>Energy is indestructible ; it is converted into other forms </li></ul></ul></ul>
6. 6. 1 st Law of Thermodynamics <ul><li>Law of Conservation of Energy: </li></ul><ul><ul><li>The total amount of energy in a system is constant </li></ul></ul><ul><li>Movie Notes </li></ul><ul><ul><li>The Three Laws of Thermodynamics AND Newton and Thermodynamics </li></ul></ul>
7. 7. 2 nd Law of Thermodynamics <ul><li>Nicolas Carnot- was named founder of thermodynamics </li></ul><ul><ul><li>Stated (simply) heat is transferred from higher to low temperature </li></ul></ul>
8. 8. 2 nd Law of Thermodynamics <ul><li>Heat will not go from lower temperature to higher temperature and goes from less energy to greater disorder </li></ul><ul><li>This is called ENTROPY </li></ul>
9. 9. 2 nd Law of Thermodynamics <ul><li>Entropy: </li></ul><ul><ul><li>This is the amount of disorder in a system </li></ul></ul><ul><ul><li>When things decay entropy is increased (disorder is increased) </li></ul></ul><ul><ul><li>Energy must be expended to do work so perpetual machines do not work </li></ul></ul><ul><ul><li>For every action there is a loss of energy and an increase in disorder </li></ul></ul><ul><li>Movie Notes: </li></ul><ul><ul><li>Myth Busters- Conservation of Energy </li></ul></ul>
10. 10. Entropy and the Universe <ul><li>Universe is heading towards more disorder </li></ul><ul><li>Energy is constantly being used and running down </li></ul>