In Problem, show that with small damping, the amplitude will build up to a value(1 - e-1 ) times the steady-state value in time
t=1/f1δ (δ=logarithmic decrement).
Problem
A spring-mass system with viscous damping is initially at rest with zero displacement. If the system is activated by a harmonic force of frequency ω= ωn= [√k/m ] determine the equation for its motion.