Thursday, July 2, 2015

Oscillations, Waves, and a brief summary of the rest of It

Galloping Gertie, the Tacoma Narrows bridge disaster, is a famous example of resonance.
https://www.youtube.com/watch?v=j-zczJXSxnw

Different modes of sound wave propagation are described in this non-destructive evaluation site.
http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/modepropagation.htm

An excellent site for virtual demonstrations of waves, light, sound, etc. is available through the University of Salford, Manchester, U.K. The link is here:
http://www.acoustics.salford.ac.uk/feschools/waves/waves.htm

Ocean waves are "gravity waves," in that the restoring force comes from gravity, not waves of the gravitational force itself, a long-sought phenomenon in physics. The motions in water gravity are more complex than those of strings or sound. This site gives a great discussion of some of the issues, and the complexity of the motions.
http://hyperphysics.phy-astr.gsu.edu/hbase/waves/watwav2.html

Here's a link to an amazing pendulum array video. It shows a series of pendulums with monotonically increasing lengths that are started in phase, and that each oscillate at a different rate. The resulting patterns are fascinating, surprising, and often beautiful.
http://www.youtube.com/watch?v=yVkdfJ9PkRQ

This is an excellent discussion of error analysis and reporting from Prof. Frank L. H. Wolfs,
Department of Physics and Astronomy, University of Rochester, NY

A set of neat little applets from Walter Fendt. Scroll down to the oscillations and waves section to see simulations of resonance, coupled pendula, beat frequencies, etc.

A set of physics applets from the University of Colorado, including waves, motion, quantum, light, and many others.

A “friction harp” that uses resonance to produce tones. “Tis a Gift to be Simple”


A really nice simple harmonic motion demonstration at CoLoS, Conceptual Learning of Science, showing a revolving circle linked to an oscillating spring. Very clear depiction of displacement, velocity, and acceleration.

Physics demonstration videos from Wake Forest University Dept. of Physics.


A nice video on Einstein's theory of relativity.

https://www.youtube.com/watch?v=xvZfx7iwq94

And one on visualizing the fourth dimensions, and more.
https://www.youtube.com/watch?v=MN4KC_zlW4g

Michio Kaku on the 11 dimensional branes that string theory postulates.
https://www.youtube.com/watch?v=jI50HN0Kshg

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