Lecture4

# Lecture4 - ME200 : Thermodynamics I Lecture 4 : Mechanical...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : [email protected] Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 4 : Mechanical concepts of energy, work

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2 Outline Energy Work
3 Definition of Work Work – with force [N] acting through a distance [m]. M g a M

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4 Work W : work done the system : work done the system W>0 W<0
5 Units and types Units - Force * distance = [Nm] or [J] - lbf-ft or BTU (British Thermal Unit) in English units - 1 Btu = 778.169 lbf-ft = 1.055056 kJ Mechanical work Types – body accelerated by a force; work done on the body is the stored in kinetic (resulting from motion) form – body moved against the gravitational force (F=mg) is the stored in potential form

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6 Kinetic Energy Fs ds V y x Left : change in kinetic energy (KE) Right : work done with Force F s along pathway s ? ? = °± = °²³ ²´ = °³ ²³ ds °³²³ µ 2 µ 1 = ? ? ²? 2 1 = · ¸ °(³ ¹ ¹ − ³ º ¹ ) = ?
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## This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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Lecture4 - ME200 : Thermodynamics I Lecture 4 : Mechanical...

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