Vibration is an oscillating motion of an object through the equilibrium point periodically.
1 vibration from 2 – 1 – 2 – 3 – 2
a half vibration from 2 - 1 - 2
B. Deviation and Amplitude
Deviation is a particle vibrated positions toward the equilibrium point.
Amplitude is maximum deviation of a vibration from an equilibrium point of an oscillating object.
C. Period and Frequency
Period ( T )is the time needed to complete one oscillation
Frequency ( f ) is the number of oscillation occurred in one second
Hence, we can say that frequency is inversely proportional to period.
WAVE
Wave is preparative vibration. In its propagation, wave transfers energy from a place to other place, while the passed medium does not propagate.
Wave and Its Kinds
Based on the wave medium, there are two kinds of wave, i.e:
a. Mechanic wave
A wave in which the propagation needs an intermediate medium, for examples: sound wave,string wave
b. Electromagnetic wave
A wave in which it can propagate in vacuum or without medium, for example: light, sonar wave, radio wave
Based on the direction of propagation, there are two kinds of wave, i.e transverse wave and longitudinal wave.
A. Transverse Wave
Transverse wave is a wave that the direction or vibration is perpendicular toward direction of propagation. For examples: string wave, light,wave on water surface
B. Longitudinal Wave
Longitudinal wave is a wave that the direction of vibration is parallel with direction of propagation. For example: wave on spring and sound wave.
Speed of Wave
The speed of wave is a required distance to pass the wave per time unit
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