The differential equation of motion for a system that is subjected to Coulomb damping (dry friction) of constant magnitude is
where F is the generalized constant friction force. Assume that the system is released from rest at q = q0, and let F = 0.15K q0.
(a) Draw the phase plane plot for the system. (Hint: See Prob. 20.79.)
(b) From the phase plane plot, determine the reduction of amplitude in each cycle of oscillation, and the point where the system comes to rest