Vibration is not just about the back and forth motion an object is doing, but vibration also includes:


- Frequency


-Period


-Amplitude





Frequency = Number of vibration in one second


                             formula:    F=N/T


 Period = Time needed for one full vibration


                            formula:     P=T/N


Amplitude = The distance between the maximum distance and the stable motion




                           

                          T = 1/F  second  OR    F = 1/F Hz




                                

                           SI unit for frequency = Hz (Hertz)

                 

                               SI unit for period = s (seconds)




Example:





Frequency:    


 1. What is the frequency of......


a) 2 second -> 4 vibration?

Answer = 4 ÷ 2 = 2 Hz

b) 5 seconds -> 35 vibration?

Answer = 35 ÷ 5 = 7 Hz      






2. What is the period of.......




a) 2 vibration -> 18 seconds?

Answer = 18 ÷ 2 = 9 seconds


b) 5 vibration -> 125 seconds?

Answer = 125 ÷ 5 = 25 seconds