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The object is in the 5 o'clock position. I draw the
m*g as a vertical vector pointing down. I decompose
it into two components: radial (away from the center)
and tangential (clock-wise direction). Then I draw
the normal force vector
which has the same length
as the radial component of m*g but the opposite
direction.
So far all is the same as when r is infiniteDr. Vern Lindberg
(an object sliding along an inclined plane).