Chapter8_1-3_FA05

# Chapter8_1-3_FA05 - The power of Niagra Falls Height 167 ft...

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The power of Niagra Falls Height: 167 ft Flow: 600,000 U.S. gallons per second

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The power of Einstein Kinetic energy: E = ½ mV 2 Energy of matter: E = mc 2
Potential Energy and Conservation of Mechanical Energy Chapter 8-1 / 8-3 CONSERVATIVE FORCES are forces that…. . •Produce only mechanical motion •Store energy in mechanical motion Examples are gravity and spring forces. NON-CONSERVATIVE FORCES are forces that…. •Create energy in the form of heat, sound, or other non-mechanical process •Cause a transfer of energy from one system to another Example is friction.

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Work of a conservative force can be positive or negative. x x F F Work of gravity is NEGATIVE. Work of gravity is POSITIVE. W = F * D
Work done by a conservative force around a closed path is zero. This leads to an important conclusion…. .

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The work done by a conservative force is independent of the path, and depends only on the starting and ending points. Closed path, W=0. Pick any starting and ending points. A B A B W 1 W 2 W 1 = W AB W 2 = W BA W 1 + W 2 = 0 W3 W 1 + W 3 = 0 So, all paths from B to A take the same amount of work. W 1
Conservative forces produce “Potential Energy” x = H F F U initial U final W = - U = -(U final - U initial ) W = F x = -MgH so MgH = (U final - U initial ) Gravitational Potential Energy U = Mgy Mgy fi - Mgy in = (U final - U initial )

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## This note was uploaded on 08/16/2011 for the course PHY 2053 taught by Professor Vellaris during the Fall '08 term at University of Central Florida.

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Chapter8_1-3_FA05 - The power of Niagra Falls Height 167 ft...

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