Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Bead and spring model of a stretched long chain polymer. (A) When not perturbed, the monomers are aligned along the chain. (B) When perturbed in the middle of the chain, the tension along the chain tends to straighten the perturbed parts. This leads to a force directed toward the axis of the polymer, which in our case is modeled by a weak harmonic spring.
