energyOpt

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Energy Energy is a property that enables something to do work Energy has various forms (kinetic, potential, rest energy) Kinetic energy is the energy of a moving object m v 2 KE = --------- 2 It takes ~1000 N (or ~ 225 lbs) to hit a nail and drive it 5 mm into a surface. 100’s of free ppt’s from www.pptpoint.com library
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Potential Energy Potential energy is a capacity of doing some work Potential energy is the energy of position Gravitational Potential Energy W = F d = m g h = PE (potential energy) PE is relative! PE of a 1000-kg car at the top of a 50-m multilevel parking lot is: m g h = (1000 kg)(9.8 m/s2)(50 m)=490 kJ
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Rest Energy Mass and Energy are related to each other and can be converted into each other. The rest energy of a body is the energy equivalent of its mass. E 0 = m 0 c 2 E 0 ( m =1 kg) = 1 kg x (3 10 8 ) 2 (cm/s) 2 ~ 10 17 J PE ( m =1 kg, h =9 km) = m g h = 1 kg x 9.8 m/s 2 x 9000 m ~ 10 5 J
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Energy Transformations Many mechanical processes involve interchanges between KE, PE, and work. Energy exists in some other forms: chemical energy, heat energy, radiant energy, etc.
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Conservation of Energy Energy cannot be created or destroyed. It can only be changed from one form to another. The above statement is called the law of conservation of energy
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Chapter 5 Light and Atomic Structure Light and its properties Atomic structure Interaction between Light and Matter Spectrum
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Light in Everyday Life Light is a form of energy,
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This note was uploaded on 11/17/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.

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energyOpt - 100s of free ppts from wwwpoint.com library...

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