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# Lecture-11 - Work WorkandEnergy Lecture#11 Ch.6.4 6.9...

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Work and Energy L t #11 Ch 6 4 6 9 Lecture #11 – Ch. 6.4 – 6.9 Physics 125 – Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] Office Hours: 2:00 4:00 / Mon & Tue in Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Gravitational Potential Energy Work done by the Force of Gravity (Weight): ( ) ( ) gravity 0 0 0 f W mg cos 0 s mg h h mgh mgh PE PE . = ° × = = = PE mgh (G it ti l) P t ti l E = (Gravitational) Potential Energy
Work of Gravity Work done by the Force of Gravity (Weight) in this case: gravity 0 0 f W mgh mgh PE PE . = = The Work done by the force of gravity (mg) is The Work done by the force of gravity (mg) is INDEPENDENT of the path; it depends ONLY f 0 on the final (h ) and initial (h ) height ralative to the surface of the Earth to the surface of the Earth.

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Conservative Force Th F f G it i The Force of Gravity is a CONSERVATIVE FORCE. A CONSERVATIVE FORCE is a force for which the Work done b it i i d d t f th th b t th i iti l d fi l iti by it is independent of the path between the initial and final positions.
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