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

 

 

VIBRATION

      WHAT IS VIBRATION?

A vibration is the motion of the object that are moving back and forth of an object passing through a balance position . The oscillating motion is called a Vibration

EXAMPLES OF VIBRATION MOTION:
these are the common examples of vibration such as the following:


                                                 1.     Vibration of a pendulum

A swinging Pendulum

                  
                                                     2.    Vibration of a plastic ruler

a plastic ruler making a vibration

3.    Vibration of a spring

a spring makes vibration

            CALCULATION OF VIBRATION / HOW TO KNOW THE MOTION OF VIBRATION

a swinging pendulum

Vibration is calculated by how many times the object moves back and forth. For Example:

 The motion is : 1 - 2 -3 - 2 - 1

*A motion of one vibration is always 4 counts, and we do not count the first one as it is the original position of the object and where the vibration starts from.*


OTHER EXAMPLE OF VIBRATION MOTIONS:

a vibration of...........

1/2:       1 - 2 - 3

1/4:       1 - 2

3/4:      1 - 2 - 3 - 2