Physics 202 Lecture Notes - PCCspot.pcc.edu/~dulrich/2013p202/2013p202ln02.pdf · The three phases of matter are characterized by how they respond to external force Physics 202, Lecture

Elasticity

Physics 202, Lecture 2

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The three phases of matter are characterized by how they respond toexternal force

Physics 202, Lecture 2

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As solids deform, they “push back” — this elasticity is often shown withsprings

Physics 202, Lecture 2

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An ideal spring is the simplest elastic system and is defined by Hooke’sLaw

Physics 202, Lecture 2

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Energy in an ideal spring is parabolic; the amplitude is tied to the totalenergy

Physics 202, Lecture 2

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The forces need not be perfectly linear to apply these concepts: e.g., thependulum

Physics 202, Lecture 2

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The deformation that results from small stress is linear (Hooke’s law again)

Physics 202, Lecture 2

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Stress is from multiple forces on an object — can be classified as threebasic types

Physics 202, Lecture 2

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Newton’s law of gravity creates stress on an astronomic scale: tides andgravity waves

Physics 202, Lecture 2

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