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Published byLynette Austin Modified over 9 years ago
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FEYNMAN LECTURES ON PHYSICS: Conservation of Energy
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What is energy? Imagine a child, perhaps "Dennis the Menace" Energy is an abstract concept When all is calculated energy is constant We see that the energy is the same before and after but don’t understand why
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What is energy? “we have no knowledge of what energy is. We do not have a picture that energy comes in little blobs of a definite amount. It is not that way.” There are many forms of energy and we have formulas for all of them to put in an equation energy heatgravityElasticElectricalChemicalKineticNuclearRadiantMass
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Gravitational Potential “Let us also make a hypothesis: that there is no such thing as perpetual motion” Can consider a weight balance machine GPE = Weight X Height Reversible machine = X Normal machine = Y Y is less than X otherwise perpetual motion!! 3mX=m3X
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Kinetic Energy “Of course, the fact that motion has energy has nothing to do with the fact that we are in a gravitational field. “ In the case of kinetic energy a pendulum can be considered KE=weight X height A formula is needed that relates velocity to height Turns out to be KE=WV 2 /2g
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Other types of energy “Ordinarily when things roll, there is bumping and jiggling because of the irregularities of the material ” Consider a Spring Adding the weight X heights doesn’t check out! Something needs to be added Spring stops moving after a time There are many types of energy like light, heat, radiation etc.
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