I know that there is phase delay in damped driven oscillation but I want to know is there any phase delay in undamped driven oscillation when we apply sinusoidal driving force. When driving force is maximum, displacement is also maximum as well right?

  • $\begingroup$ It depends on initial conditions. In general case there is phase shift but for very specific initial conditions they oscillate with the same phase. $\endgroup$ May 29 at 11:52
  • $\begingroup$ The initial conditions should be equilibrium right? Where the position is at equilibrium and velocity is zero. $\endgroup$
    – Physics33
    May 29 at 12:23
  • $\begingroup$ I have seen a lot of differential equation solutions (particular solution) for undamped driven oscillation. Almost all of them states that the phase delay is always zero. $\endgroup$
    – Physics33
    May 29 at 12:26
  • $\begingroup$ The initial conditions could be arbitrary. But even for zero initial conditions phase shift is not zero for force frequency below resonance. $\endgroup$ May 29 at 13:12
  • $\begingroup$ Even there is no damping force, there is phase delay also? $\endgroup$
    – Physics33
    May 29 at 15:24

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