Question

when friction reduces the mechanical energy of the system as time passes, the motion is said to be​

Answer 1

Answer:

friction is quite small, so the oscillations continue but aplotide gradually reduces, damped would be the best choice. To derive the damped oscillations you should note a salient point that friction will always oppose the velocity in direction and you could assume it to be more or less constant in magnitude till the pendulum continues to move.