must be able to draw free-body diagrams well.
know the different forces acting on an object, then relate all of
them using an equation. after that, rearrange the equation to find
the unknown.
still got other tips but i shall elaborate about them later.
btw circular motion only a few formulas to rmbr
omega = 2 pi frequency = 2 pi / time perioud
velocity = radius x omega
acceleration = radius x (omega)^2 = (velocity)^2 / radius
force = mass x acceleration