I waz really perplexed, in 1967, when our advanced maths teacher, after years of stupid calculations, casually informed our class that `they are now saying .. there is no such thing as centrifugal force` ????? ..`just centripetal force`. .. I didnt undrstand it then, but thanks to cat's ginger beer?? i now `get it`
.... now that IS fun!!
.. so !!! (isnt that word annoying) ........
a tyre rotates around the axle,
the spokes provide the centripetal force (inwards) through their tensile strength,
these combine to try tp pull the metal rim inwards,
the rim (mostly) resists this through its strength and rigidity, and spoke connections,
the tyre, being flexible, has less rigidity, and the forces acting upon it (as with the rim)
are the centripetal forces and the rotational forces acting always at the tangents normal to the axle,
(not counting the forces from the road or heat or brakes etc).
But, for every force there is an equal and opposite force, if a thing is to remain `stable`.
The rim remains relatively stable (in shape) because the `centrifugal` forces are accommodated ok,
but the tyre, being flexible, will succumb somewhat to the `centrifugal` forces
outwards in a direction opposite to the centripetal forces
until an equilibrium is reached within the tyre structure which provides an internal resistance to deformation,
but not before the tyre has deformed outwards enough to provide that resistance.
The main forces acting on the tyre are centripital and rotational ...
but it is the
inertia of the tyre that is providing the apparent `centrifugal` forces,
as it resists its mass being moved constantly inwards.
