Frequency, Period, and Amplitude

Frequency: The number of vibration in 1 second.
Period: The number of time needed to achieve a 1 full vibration.
Amplitude: The distance between the maximum position of a vibration and the balanced position of a vibration.

The SI unit for frequency is Hz ( Hertz)
While the SI unit for a period is s (Second)

n: The number of motion of a vibration       t: Time
Formula of frequency: n/t
Formula of period: t/n

Question
1. What is the frequency: 15 vibration --> 3 second?
Answer:
F: n/t
F: 15/3
F: 15÷3= 5 Hz
So the frequency is 5 Hz

2. What is the Period: 3 vibration --> 12 seconds?
Answer:
P: t/n
P: 12/3
P: 12÷3= 4s
So the period is 4s

Vibration

                                                                                What is vibration?


Vibration is when an object's motion is moving back and forth, passing through its balanced position. What's meant by back and forth is when in one moment, the object moves away from its balanced position, and in another moment it will eventually move towards the balanced position, and so on it will continue.


Examples
One of the example of vibration is when you put a ruler in the end of a table. Most of the ruler is off the table. When the part of the ruler which is off the table is pushed, then it will create a vibration movement.

How to know the motion of a vibration?
A pendulum is swung at back and forth and is seen as it is going from the left to the right. If the pendulum is moving in one vibration, what would its motion be?

The motion is: A - B - C - B - A

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 examples of vibration motions
A vibration motion of.......
1/2 Motion: A-B-C
1 Motion: A-B-C-B-A
2 1/4 Motion: A-B-C-B-A-B-C-B-A-B
2 3/4 Motion: A-B-C-B-A-B-C-B-A-B-C-B