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PHYS16 – Lecture 37. Ch. 16 Wave Motion. “Interference is much clearer in HD”. Oscillations pre-question. Is a bouncing ball an example of simple harmonic motion? Yes No. Oscillations pre-question.

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phys16 lecture 37

PHYS16 – Lecture 37

Ch. 16 Wave Motion

“Interference is much clearer in HD”

oscillations pre question
Oscillations pre-question
  • Is a bouncing ball an example of simple harmonic motion?
    • Yes
    • No
oscillations pre question1
Oscillations pre-question
  • Two kids are swinging on two swings of the same height – one kid is a little chubbier than the other. Neglecting frictional forces, which kid completes a back and forth swing in the fastest time?

A) The chubby kid

B) The skinny kid

C) The kid who pushes off the ground the best

D) Both complete in the same time

oscillations pre question2
Oscillations pre-question
  • A mass on a spring is driven at a driving frequency (red curve) and the resulting position vs. time of the mass is given (blue curve). Which case is closest to resonance?
ch 16 wave motion
Ch. 16 Wave Motion
  • Mechanical Waves
    • Transverse vs. Longitudinal
    • Properties
  • Example: Wave on a String
    • How the wave propagates
    • Speed
    • Reflection and Transmission
  • Superposition and Standing Waves
waves pre question
Waves pre-question

PhET website

waves pre question1
Waves pre-question

0.0133

PhET website

mechanical waves1
Mechanical Waves
  • A propagating oscillation that moves through a medium

Transverse – water waves, disturbance on a string

Longitudinal – sound waves, slinky or spring

mechanical waves2
Mechanical Waves
  • Waves use at least 1-3 space dimensions and time…
    • Ex. – Water waves propagate in x, move “up and down” in y, and change position with time
    • Ex. – Sound waves propagate in x, move “up and down” in x, and change position with time
wave properties
Wave Properties
  • Period –

high

period

medium

period

low

period

T

wave properties1
Wave Properties
  • Period –
  • Wavelength and Wave number –

http://seagrant.uaf.edu/marine-ed/curriculum/images/stories/grade7/wave.jpg

wave properties2
Wave Properties
  • Period –
  • Wavelength and Wave number –

http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/Images_specific/wave_def.gif

wave properties3
Wave Properties
  • Period –
  • Wavelength and Wave number –
  • Wave speed –

http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/Images_specific/wave_def.gif

example speaker
Example: Speaker

Speed =

Period =

Wave number =

Wavelength =

330 m/s

0.0038 s

5.0m-1

1.25 m

PhET website

example sand on a vibrating plate
Example: Sand on a vibrating plate
  • Sand is placed on the vibrating plate below. Which apparatus is vibrating the plate with the highest wave number?
wave function or waveform
Wave Function or Waveform

Plane Wave

Higher Dimension Wave

wave on a string1
Wave on a String
  • You can generate a wave on a string by pulsing sting with your hand
  • Speed of pulse/wave is related to tension in string and mass density of string

PhET website

propagation of pulse
Propagation of Pulse
  • If you advance the movie one frame point A will move… (higher, lower, right, left)?
  • If generate new pulse but more quickly than first then it will be… (same, wider, narrower)?
  • If generate new pulse but move hand higher than first then it will be… (same, taller, shorter)?
  • If generate new pulse with rope tightened then pulse will be… (same, faster, slower)?

PhET website

example question
Example Question

PhET website

main points wave properties
Main Points – Wave Properties
  • Mechanical Wave – a propagating oscillation that moves through a medium
  • Period –
  • Wavelength and Wave number –
  • Wave speed –