Class 9: Conservation of Energy Class 9: Conservation of Energy - - PowerPoint PPT Presentation

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Class 9: Conservation of Energy Class 9: Conservation of Energy - - PowerPoint PPT Presentation

Sep 14, 2022 1.65k likes •1.82k views

Class 9: Conservation of Energy Class 9: Conservation of Energy Potential Energy on Earth Surface U(y) = mgy g y y = 0 0 You are free to choose the You are free to choose the zero level Potential Energy of a Spherical Object Potential Energy of

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Class 9: Conservation of Energy Class 9: Conservation of Energy

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Potential Energy on Earth Surface U(y) = mgy g y y = 0 You are free to choose the You are free to choose the zero level

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Potential Energy of a Spherical Object Potential Energy of a Spherical Object M r m a

M r Mm G

  • U(r) =

For r >a only U(∞) = 0 For r >a only. U(∞) = 0

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Potential Energy of a Charge Potential Energy of a Charge Q r q a

Qq 1 r Qq 4 1 U(r) πε =

For r >a only U(∞) = 0 For r >a only. U(∞) = 0

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Potential Energy of a Spring Potential Energy of a Spring Hooke’s Law: F kx F = ‐kx U ½ kx2 (U at natural length 0 ) U = ½ kx2 (U at natural length = 0 )

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Conservation of Energy Conservation of Energy ΔT + ΔU ΔT + ΔU = Work done by all non‐conservative forces.