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# 8th Grade Chapter 5 Lesson 3

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For Student Use Only

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### Transcript

• 1. 8 th Grade Chapter 5 Lesson 3 Pgs. 199-205 For Student Use Only
• 2. 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
• 3. 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
• 4. 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)
• 5. 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
• 6. 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
• 7. 2 nd Law of Thermodynamics
• Nicolas Carnot- was named founder of thermodynamics
• Stated (simply) heat is transferred from higher to low temperature
• 8. 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
• 9. 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
• 10. Entropy and the Universe
• Universe is heading towards more disorder
• Energy is constantly being used and running down