17 lines
887 B
Markdown
17 lines
887 B
Markdown
[[Work Energy and Power]]
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megumi energy
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# Summary
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* potential energy refers to multiple objects in a system affecting each other with conservative forces
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* In MY words, potential energy is j stored kinetic energy that something has due to its surroundings, and it cashes it out and converts the PE to KE.
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* Scalar
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* You choose where potential energy is 0 to make a job easier
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* Elastic potential energy of an ideal spring: $U_s=\frac{1}{2}k(\Delta x)^2$
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* Gravitational potential energy between 2 spherical masses: $U_g=-G\frac{m_1m_2}{r}$. Near surface approximation: $\Delta U_g=mg\Delta y$
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* For a system with more than 2 objects, potential energy is sum of energy of every pair.
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# Zero Potential Energy Definition
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* Can define zero PE as any convenient reference point
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* For gravitational PE, a common ref point is ground level.
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* Springs equilibrium is the natural zero PE point.
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