Question

what is phase and phase difference in S.H.M.?

Answer 1

Displacement in SHM is given by x = A sin( wt) where A is amplitude, w is angular velocity, t is instantaneous time. ... Hence phase difference between velocity and acceleration is also pi/2. Phase difference betweendisplacement and acceleration is pi radians or 180 degrees.

Answer 2

in the phasor diagram the phase is the angle from the mean to the current position at t=0

and phase difference is the difference of phase of two particles in SHM