Physics
posted by Mike .
A 1400kg car rounds a curve of 57m banked at an angle of 14 degrees.
If the car is traveling at 98km/h (27m/s), will a friction force be required? If so in what direction?
How much friction force will be required?

Let the xaxis point toward the center of curvature and the yaxis point upward. Use Newton’s second law.
ΣFy = N• cosθ − mg − f •sinθ = 0 ...(1)
ΣFx = N• sinθ + f •cosθ = m•v²/R,....(2)
Solving the 1st equation for N, we obtain
N =( f •sin θ + m•g)/cos θ,
Substitute N to the 2nd equation and obtain friction force
f =m[(v²•cosθ/R)  g•sinθ]. 
f=[fy.fx].N

this sucks. no help at all