Effect Of Tension On Resonance And Amplitude
PLANNING
Aim
The aim of the experiment is to investigate the effect of tension on
resonance and amplitude of a string.
Basis Personal Knowledge
This experiment is based on the resonance, frequency and amplitude.
From what I have learnt in class and everyday life, I know that when a
string of any kind is plucked, it moves to and fro. The movement
causes the air molecules around it to vibrate. When it moves fast
enough, the vibrations cause a sound to be heard.
Research
Some research was carried out into the principles on which the
experiment is based.
The frequency of an oscillation is defined as the number of cycles
executed per unit time (Salters Horners Advanced Physics)
That is for a spring the time taken for it to move to and fro once is
its frequency. Frequency is measured in Hertz (Hz).
Each object has its own natural frequency. (Physics For You by Keith
Johnson). Resonance occurs when the applied frequency equals the
natural frequency of the object.
Therefore when the string to be used in the experiment is plucked and
the applied frequency equals its natural frequency then resonance
occurs.
The resonant frequency of a string can be increased by:
* Shortening the length
* Increasing the tension
* Using a lighter string
Variables and Constants
The experiment is basically concerned with the effect that the tension
will have on the frequency and amplitude. Therefore, the basic
variable will be the tension of the string. The constant in this case
would be the thickness of the string, as it will not be changed. This
should ensure that the experiment is fairly accurate as its thickness
can affect the resonance.
Application of Principles
The principles of frequency, resonance and amplitude are largely
applied in many engineering projects.
The understanding of the above principle is vital to ensure that
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