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
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.
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
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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