The orbit of each planet is an ellipse, with the Sun at one focus.

        An imaginary line drawn from each planet to the Sun sweeps out equal areas in equal times; the Earth moves faster around the Sun when it is nearest the Sun.

         The ratio of the square of a planet’s orbital period (T) is proportional to the cube of its mean distance (s) from the Sun (s).  s³/T²

F = G (m₁m₂/r²)

Banked Curve 

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μ_k =  f_fr/N

f_fr = w_║= mg sin θ

N = w_┴ = mg cos θ

μ_k =  tan θ