Out of my free will , I create a current of water, falling into a bucket supported by a string. So the mass inside the bucket increases. So the string underneith it, will be pressed. I can differentiated equation 6 by time. So there will be a differentiate force dF/dt instead of a force F descibing this problem. If we are allowed to descibe the world using dF/dt, that is third order, then we could describe rotating graviataional ellipses. Action of third order is minus reaction of third order.
dF_action/dt = -dF_reaction/dt
20190624 ir.S.J. Boersen

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