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What is pure simple harmonic oscillation...

What is pure simple harmonic oscillation? Why they are not 100% possible in practice?

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If no resistive or internal frictional force should be acting on a mechanical system to execute simple harmonic oscillations, then these oscillation is known as pure simple harmonic oscillation.
Such oscillation is an ideal situations. Hence, these oscillation cannot be obtained in practice.
In practice, oscillations of any mechanical system tekes place in some medium and hence resistive forces and internal forces pruduces. Therefore, in practice no pure simple harmonic motion execute.
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