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Difference between viscous damping and coulomb damping.
Viscous damping Coulomb damping
1] In case of viscous damping, the ratio of 2 successive amplitudes was constant and envelope of maximas of displacement time curve was exponential curve. 1] In case of coulomb damping, the difference between any 2 successive amplitudes is constant and envelope of maximas of displacement time curve was straight line.
2] In viscous damping, the system once disturbed from mean equilibrium position then finally it comes to rest in equilibrium position only and theoretically it takes $\infty$ time. 2] In coulomb damping,the body may finally come to rest in equilibrium or in displaced position depending upon the initial amplitude and amount of friction present.
3] Damping force is proportional to the velocity. 3] Coulomb's damping force is independent of velocity but depends on the co efficient of friction.
4] In viscous under damping system mass oscillates about the same mean position. 4] Mean position about which mass oscillates varies with each half cycle.
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