Chapter8_1-3_FA05

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

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

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