Brachistochrones With Loose Ends

Details Brachistochrones With Loose Ends Brachistochrones With Loose Ends

2008-10-03

arxiv.org/abs/0810.0605v1

European Journal of Physics 29, 1191-1199 (2008)

Physics

Classical Physics

10 pages, 6 figures

Scientific paper

10.1088/0143-0807/29/6/008

The classical problem of the brachistochrone asks for the curve down which a body sliding from rest and accelerated by gravity will slip (without friction) from one point to another in least time. In undergraduate courses on classical mechanics, the solution of this problem is the primary example of the power of the variational calculus. Here we address the generalized brachistochrone problem that asks for the fastest sliding curve between a point and a given curve or between two given curves. The generalized problem can be solved by considering variations with varying endpoints. We will contrast the formal solution with a much simpler solution based on symmetry and kinematic reasoning. Our exposition should encourage teachers to include variational problems with free boundary conditions in their courses and students to try simple, intuitive solutions first.

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