  In this paper we show all possible ramps where an object can move with
constant speed under the effect of gravity and friction. The planar ramp are
very easy to describe, just rotate a curve with velocity vector
(tanh(as),sech(as)). Recall that tanh(as)^2+sech^2(as) = 1. Therefore, the
solution of the planar constant speed problem is connected with easy to
describe examples of curves with arc-length parameter. For ramps in the space,
we show that there are as many ramps as tangent unit vector fields in the south
hemisphere. A video explaining these results can be found at
http://www.youtube.com/watch?v=iBrvbb0efVk
