Sunday, 9 February 2020

classical mechanics - Friction in Lagrangian formulation


We know the Lagrange equations are: Lqiddt(L˙qi)=0.

Then, when we add friction in there, we rewrite it in terms of the Rayleigh dissipation function as Lqiddt(L˙qi)=F˙qi.
However, this is assuming that you can write the friction force as Ff=k˙qi. How would you do it for a case where the friction force is not proportional to velocity? For example, in the case of a block sliding on a flat surface the friction would be Ff=m¨q, which is proportional to the acceleration not the velocity.




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