Molecular dynamics calculations have been carried out on a system of identical particles interacting through a Lennard-Jones potential containing a heavy test particle. It is shown that the autocorrelation function of the total force can be used to compute the friction constant, if an appropriate cutoff is introduced. In the limit of large mass and density, the test particle behaves as a Brownian particle, with a friction constant that is mass independent and obeys the Stokes law.
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Brey et al. (1982) studied this question.
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