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Old Jul 2nd 2015, 07:33 AM   #1
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Join Date: Jun 2014
Posts: 67
Reflected wave from free end

A wave pulse on a string moving from left to right towards a free end will reflect and propagates from right to left with the same speed and amplitude as the incident wave, and with the same polarity.

My question is, why the slope and the vertical force must be zero at the free end? If the restoring force is zero why the free end can move? Some textbooks explain by imaging a wave with same polarity traveling in opposite direction but I think it's just an analogy and the phenomenon is better be explained by force interaction.

Some ref:
p. 489 University Physics
https://books.google.com.hk/books?i...QWssoDgAw&ved=0CCQQ6AEwAQ#v=onepage&q&f= false

http://www.acs.psu.edu/drussell/Demo...t/reflect.html
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end, free, mechanical wave, reflected, wave, wave disturbance



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