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torsion potential

torsion potential.jpg

what is n?
(edited 10 years ago)
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Borek
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Uncle google: http://www.ks.uiuc.edu/Research/namd/2.7b2/ug/node23.html
Original post by celina10
torsion potential.jpg

what is n?


Just an integer as cos repeats itself every 2Pi.... e.g. cos (2pi) = cos (n*2Pi)

Original post by Borek


https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcQEXv0VOdvVZmGSyYlwLgEO2r-DlAPIrgm0R6tICypbD6gb8URIbg
Original post by JMaydom
Just an integer as cos repeats itself every 2Pi.... e.g. cos (2pi) = cos (n*2Pi)



https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcQEXv0VOdvVZmGSyYlwLgEO2r-DlAPIrgm0R6tICypbD6gb8URIbg


so is n however many times cos repeats itself?
Original post by celina10
so is n however many times cos repeats itself?


No...? It's just because cos (x + n*2pi) = cos (x)
Original post by JMaydom
No...? It's just because cos (x + n*2pi) = cos (x)


How would we know what n is? What information would we use?
It doesn;t matter what n is, thats my point. The torsion will be the same if you rotate it by 360 or by any multiple of 360!!!!!
Original post by JMaydom
It doesn;t matter what n is, thats my point. The torsion will be the same if you rotate it by 360 or by any multiple of 360!!!!!


oh ok so when working out the torsion potential we don't need to worry about what n is, but if its not necessary why is it in the equation?

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