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Explanation
When a body is vibrating, its displacement from the mean position changes with time
Instantaneous Displacement
The value of its distance from the mean position at any instant is called instantaneous displacement. It is zero at the mean position and it is maximum at the extreme positions.
Amplitude
The maximum value of displacement is known as amplitude.
Explanation of figure
The arrangement can be used to record the variations in displacement with time for a mass spring system.
The strip of paper is moving at a constant speed from right to left giving a time scale on the strip.
A pen attached with the vibrating mass records its displacement against time.
the curve showing variation of displacement with time is a sine curve. it is known as a waveform of shm.
mean position, extreme position, amplitude.