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Lecture 5 Notes

# Lecture 5 Notes - Recap of last lecture Chapter 13 Periodic...

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Recap of last lecture Chapter 13, Periodic motion 2 d 2 2 2 d max ω b ) (k F A + - = The amplitude has a maximum at ϖ d = √(k/m) this is called a resonance. Forced (driven) oscillator With: solution ) cos( ) 2 / ( φ ϖ + = - t Ae x t m b 2 2 4 m b m k - = ϖ & For damped spring with a damping force of F x = -bv x we have dt dx m b x m k dt x d 2 2 - - =

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Chapter 15 Waves & Acoustics Mechanical waves (waves that need a medium)
Types of mechanical waves When particles move perpendicular to the direction of propagation of the wave are called transverse waves When particles move parallel to the direction of propagation of the wave is called longitudinal waves

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Types of mechanical waves 1. The disturbance propagates through the medium at a fixed speed which is based on the properties of the medium 2. The particles themselves are not transported, they just oscillate about their equilibrium position 3. Energy must be supplied to the medium to set the system into motion the wave motion is transfer of this energy it does not involve transfer of matter.
Periodic waves If the driving force is applied repeatedly at fixed interval we have a periodic

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Lecture 5 Notes - Recap of last lecture Chapter 13 Periodic...

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