Q.1 Define Vibrational motion, Time period, frequency, displacement and amplitude
Ans. Vibrational Motion:
the to-and fro (back and forth) motion of body about is mean position is called vibrational motion. For example motion of a pendulum, the motion of stretched wire of musical instrument, flapping of wings of flying bird.
Vibration:
The motion of a vibrating body from one extreme position to the other extreme and then back to the same is called one vibration.
If this is repeated after fixed time, it is called periodic vibration motion.
Time Period: T
This time to complete one vibration is called time period. It is represented by T.
Frequency: f
The number of vibrations or cycles of a vibrating body completed in one second is called its frequency. It is represented by f.
By unit rules f = no. of vibration in time = 1 sec.
1 no. of vibration in time = 1/f sec
By definition of the time period it is equal to T = 1/f sec. = Tf = 1
Displacement: x
Any distance of the vibrating body from the mean position is called displacement. It is denoted by x.
Amplitude: x0
The maximum displacement on either side of the mean position is called amplitude. It is denoted by x0.
Note:
Although the molecules in a solid are held together, they can still move and vibrate, as though connected by springs.
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