The swing problem is undoubtedly among the classical problems of mechanics. Practice has shown that, to set a swing into motion, one should squat when the swing is in the limit positions and stand erect in the middle vertical position, i.e., execute oscillations with double the natural frequency of the swing. To sustain the oscillations of the swing, the frequency of squatting can be halved. Nevertheless, a clear and complete, qualitative and quantitative, analysis of setting the swing into motion is absent in papers on oscillations and stability.
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