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Lecture23 - PHYSICS 149 Lecture 23 Chapter 11 Waves 11.5...

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PHYSICS 149: Lecture 23 Chapter 11: Waves – 11.5 Mathematical Description of a Wave – 11.6 Graphing Waves – 11.7 Principle of Superposition – 11.8 Reflection and Refraction Lecture 23 Purdue University, Physics 149 1
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Lecture 23 Purdue University, Physics 149 2 Simple Harmonic Motion Occurs when having linear restoring force F= -kx x(t) = [A] cos( ω t) v(t) = -[A ω ] sin( ω t) a(t) = -[A ω 2 ] cos( ω t) • Springs F = -kx U = ½ k x 2 ω = sqrt(k/m) Pendulum (small oscillations) ω = sqrt(L/g)
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