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Re: L2-"Negotiating" a curve.

. . . How come
that by turning the front wheel to the left the vector sum of
Fr+Fl+Ff becomes the centripetal force directed to the left
(and equal to m*v^2/R )?

You don't mean that; there is still a tangential frictional force
component (affecting the speed).
It only takes a COMPONENT of the total force in the "centripetal
direction" to effect a change of direction; the "other" (tangential)
component will affect the speed.

Bob

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor