In the non-linear differential equation m d 2 x d t 2 + β | d x d t | d x d t + K x = 0 the damping term is written as β | d x d t | d x d t instead of β ( d x d t ) 2 .

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Chapter 5.3, Problem 21E

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To discuss: In the non-linear differential equation md2xdt2+β|dxdt|dxdt+Kx=0 the damping term is written as β|dxdt|dxdt instead of β(dxdt)2.

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