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Physics of Music

Explore how a trombone produces sound through the principles of wave physics. This article delves into the mechanics of sound waves, discussing the roles of frequency and resonance in the trombone's sound production. Additionally, we examine the phenomenon of beats, where two tones with slightly different frequencies interfere, creating a periodic change in volume. The discussion extends to concepts such as 2D interference and the impact of friction on motion, further illustrating the connection between music and physics.

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Physics of Music

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Presentation Transcript

  1. Physics of Music • Explain how a trombone works in terms of the physics of waves.

  2. Galloping Gertie • Rice Resonance

  3. What will we hear if I play two tones that have slightly different frequencies? • Beats • When the sound changes in volume periodically due to the interference of the waves.

  4. 2D Interference • Sound • Water

  5. Review

  6. If the force of friction on the box is 50 N, how hard must someone pull the box up the ramp in order to get it to move at a constant velocity? What is the coefficient of friction? FN Angle of elevation is 20° mbox= 27 kg Fp Fk Fg

  7. Fp Fk Fg Fp= 140.5N = FN= 248.6 N

  8. T2 40 T1 What’s the tension in each string if the bob has a mass of 8kg? T2 T1 Fg

  9. T2 T2y= 78.4 N Fg= 78.4 N T2= 102.3 N T2x= T1 T1 T1= 65.8 N Fg

  10. Kinematic Equations for Constant Acceleration

  11. v v v v x x t t t t t t --------------------------------------------------------------------------------------------------------------------------------------------------------

  12. Velocity vs. Time Graphs • Above the time axis: moving forward • Below the time axis: moving backwards

  13. v v t t Velocity vs. Time Graphs • Going towards the time axis: slowing down • Going away from the time axis: speeding up

  14. x x x x x x Positive acceleration *Concavity of x-t graphs* Negative acceleration Concave up Concave down

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