l11 - Today Announcements HW#5 is due by 8:00 am Wed Feb...

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ISP209s10 Lecture 11 -1- Today • Announcements: – HW#5 is due by 8:00 am Wed. Feb. 24th. – Note extra credit #3 is still open (due 24th) – Final Exam is Tues. May 4 12:45-2:45pm • Work, Energy, Power recap • Temperature, Heat, and Entropy • Second Law of Thermodynamics and the arrow of time

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ISP209s10 Lecture 11 -2- Kinetic energy : energy of motion Potential energy: “stored” energy due to position Gravitational energy : energy associated with a raised Object Elastic energy : energy of a stretched or deformed object Thermal energy : energy in the form of heat due to the random microscopic motion of atoms and molecules Some Forms of Energy Red = potential Black = kinetic
ISP209s10 Lecture 11 -3- Electromagnetic energy – energy associated with electric and magnetic fields Radiant energy – energy of electromagnetic waves such as light, infrared, and X-rays Chemical energy – energy involved in chemical reactions Nuclear energy – energy involved in nuclear reactions Forms of Energy

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ISP209s10 Lecture 11 -4- The total energy of all the participants in any process remains unchanged throughout that process. That is, energy cannot be created or destroyed. Energy can be transformed (changed from one form to another), and it can be transferred (moved from one place to another), but the total amount always stays the same. The Law of Conservation of Energy Holds true in ALL domains of Physics (relativity, quantum Mechanics, Newtonian motion, special relativity, String Theory,…)
ISP209s10 Lecture 11 -5- Conservation of Energy In nature certain quantities are “conserved”. Energy is one of these quantities. Charge is another. Example: Ball on a hill A 1.00 kg ball is rolled toward a hill with an initial speed of 5.00 m/s. If the ball roles without friction, how high, h, will the ball go? ( ) m s m s m g v h mgh mv s m g mgh PE mv KE 28 . 1 80 . 9 2 / 5 2 2 1 80 . 9 ; 2 1 2 2 2 2 2 2 = !

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l11 - Today Announcements HW#5 is due by 8:00 am Wed Feb...

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