[Phys-L] Re: centripetal force question

[Roger Haar <haar@PHYSICS.ARIZONA.EDU>]

Hi,

        The tires provide a frictional force which points
toward the center of the curve.

Thanks
Roger Haar
 U of AZ

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Anthony Lapinski wrote:
> We know that a motorcycle driver leans inward (toward the center of a
> circle) when turning a corner that is UNBANKED. My question is how does
> the FBD look for the driver and cycle? Are both behaving like they are on
> a BANKED curve, or is N still vertical to balance w, and then fs is the
> centripetal force? Or is N slanted inward, and both Nx and fs add to
> provide the centripetal?
>
> It makes sense that the driver FEELS heavier during this turn, like he/she
> would on a banked curve. This means N is more, and then N would be slanted
> inward (like a banked curve), and not upward. However, N is always
> perpendicular to the surface (ground), which is flat. There appears to be
> a contradiction here. Can anyone help me out with this analysis?
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