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Quick check from College Physics, 16.3 Simple Harmonic Motion: A Special Periodic Motion
A babysitter is pushing a child on a swing. At the point where the swing reaches , where would the corresponding point on a wave of this motion be located?
Answer it in your own words before you look.
is the maximum deformation, which corresponds to the amplitude of the wave. The point on the wave would either be at the very top or the very bottom of the curve.
How did it go?