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(a) In unit-vector notation, what is the frictional force on the wheel?

(b) What is the rotational inertia of the wheel about the rotation axis through its center of mass?

Ok so the wheel is rolling smoothly which means that static friction is involved. I came up that Frictional Force = uN = u(14 * 9.8) = 137.2 u

So the only forces acting upon this object is the applied force, 15N and Friction which is 137.2 u.

Now I'm lost...I don't know where to go from here...any help please?