THE BRACHISTOCHRONE PROBLEM WITH FRICTIONAL FORCES

Abstract. In this paper we show the existence of the solution for the classical brachistochrone problem under the action of a conservative eld in presence of frictional forces. Assuming that the frictional forces and the potential grow at most linearly, we prove the existence of a minimizer on the travel time between any two given points, whenever the initial velocity is great enough. We also prove the uniqueness of the minimizer whenever the given points are suciently close. AMS Subject Classication. 58E30, 58E25, 45J05. Received October 1, 1999