lecture 1

# lecture 1 - 1 What is energy A A mysterious thing that no...

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Unformatted text preview: 1 What is energy? A. A mysterious thing that no one really understands. B. A fundamental component of the universe. C. A way to keep track of the ability to do work. D. Both (B) and (C) E. All three: A, B, & C 2 What is energy? A) “a mysterious thing that no one understands” Richard Feynman, Lectures on Physics , Vol. 1, p. 4-1. B) a fundamental component of the universe Einstein E = mc 2 (Mass can be converted to energy.) But m = E/c 2 (Says mass comes from energy!) C) keeps track of the ability to do work Energy, E Work, W 3 Today’s To Do (MSJ 6.1 – 6.3) Explain what is meant by energy . Recognize units of energy and convert between them. Explain what is meant by work . Explain what is meant by temperature . Explain what is meant by heat , heating , and cooling . 4 Divide the universe appropriately into a system of interest and surroundings . Track changes in the energy of a system due to energy flow and work done. Use heat capacities to relate the flow of energy to temperature changes using heat capacities. 5 Units of Energy Joule 1 J = 1 kg m 2 /s 2 KE = ½ mv 2 so 1 kg object moving at a velocity of 1 m/s has 1 J of kinetic energy. calorie 1 cal is the amount of energy it takes to raise the temperature of gram of water by 1 o C....
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lecture 1 - 1 What is energy A A mysterious thing that no...

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