the phone book myth revisited and a question
DESCRIPTION
The Phone Book Myth Revisited and a Question. Jorge Ballester Emporia State University. YouTube Videos. Discovery Mythbusters -The Phone Book Myth Mythbusters -Phone Book Friction Video Conclusion : The phone books can be ripped apart but cannot be slid apart. Post-it ® Note Analog. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/1.jpg)
The Phone Book Myth Revisited and a Question
Jorge BallesterEmporia State University
![Page 2: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/2.jpg)
YouTube Videos
• Discovery Mythbusters-The Phone Book Myth
• Mythbusters-Phone Book Friction
• Video Conclusion: The phone books can be ripped apart but cannot be slid apart.
![Page 3: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/3.jpg)
Post-it® Note Analog
Improved design by Travis Finney
![Page 4: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/4.jpg)
Field Testing
Model: Charlie Mahoney
![Page 5: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/5.jpg)
Chinese Finger Trap Model
http://couragetostutter.net
![Page 6: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/6.jpg)
𝑎𝑏 ≈
1200≪1
a=page thickness
N pages on each side
1𝑁 ≪1
![Page 7: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/7.jpg)
mth page
Tm
fm+1
fm
Pm
Pm+1
−𝑃𝑚+1+𝑃𝑚−𝑇𝑚𝑠𝑖𝑛𝜃𝑚=0
m
![Page 8: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/8.jpg)
Assume uniform tension
• F=applied force)
![Page 9: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/9.jpg)
Critical Number of Pages
![Page 10: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/10.jpg)
Good
• Reasonable physical basis
• Relatively simple formula
• Prediction of critical number of pages
![Page 11: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/11.jpg)
Bad
• Uniform tension assumption
• Testing all parameters is elusive.
![Page 12: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/12.jpg)
Ugly
• Interleaving the pages is inherently imprecise.
![Page 13: The Phone Book Myth Revisited and a Question](https://reader036.vdocuments.mx/reader036/viewer/2022062814/56816768550346895ddc4e3a/html5/thumbnails/13.jpg)
Questions:
• Why do we do this?
• Why don’t we do this?