Negative Forces in SMD Simulations

From: Souvik Dey (
Date: Fri May 22 2020 - 16:40:25 CDT

Dear NAMD users,

I think this is a really naive question but is bothering me a lot.

According to the SMD tutorial, the force can be negative if the extension
of the SMD atom is greater than distance between the constraint points. How
would that be theoretically possible? Does this mean that the spring gets


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