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Author Topic: torsional wave  (Read 8322 times)
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ahmedelshfie
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on: April 12, 2010, 03:36:54 am » posted from:Uberaba,Minas Gerais,Brazil

This applet created by Prof Hwang
Modified by myself
Original project:torsional wave

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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
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* pendulumsetup.jpg (19.69 KB, 672x581 - viewed 440 times.)
« Last Edit: April 14, 2010, 01:21:49 am by ahmedelshfie » Logged
ahmedelshfie
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Reply #1 on: April 16, 2010, 07:45:19 am » posted from:Franca,Sao Paulo,Brazil

This experiment consists of a metal grill that can be twisted to create torsion waves. The waves will reflect off the far end of the grill in either a free or fixed end fashion but the difference is difficult to see unless the students know what to look for exactly.
Image from http://www.phys.ufl.edu/demo/3_OscillationsWaves/B_WaveMotion/FreeFixedTorsionWaves.html


* FreeFixedTorsionWaves.jpg (91.9 KB, 640x480 - viewed 3225 times.)
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Fu-Kwun Hwang
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Reply #2 on: April 16, 2010, 11:05:18 am » posted from:Taipei,T\'ai-pei,Taiwan

The original version was created to simulate a real device.

Please check out New version of torsional wave if you want to simulatate the above demo.
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ahmedelshfie
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Reply #3 on: April 16, 2010, 05:50:04 pm » posted from:,,Brazil

Here is another version of torsional wave (demostration)

Change the c angle with slider and watch how wave propagate.
The slider for i can be used to change angle for i-th element.

The force acting on each element is
F_i= K* c_i + K_ij * (c_{i+1}-c_i)+K_ij (c_i-c_{i-1})-b*\omega_i
where c_i is the i-th angle, \omega_i is the angular velocity, b is damping constant, K_ij represent interaction between elements.
Original New version of torsional wave

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!


* torsional wave.jpg (25.18 KB, 587x484 - viewed 515 times.)
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