Posted by Mike Joseph on Saturday, June 16, 2012 at 5:21pm.
If the car is traveling at 98 km/h, will a friction force be required? If so, in what direction?
How much friction force will be required?
Confused. May someone walk me through this problem step by step. Thank you

Physics Vehicle application  Elena, Sunday, June 17, 2012 at 8:13am
If this problem is the second part of the problem from your previous post, then
ΣFy = N• cos θ − mg − f •sin θ = 0
ΣFx = N• sin θ + f •cos θ = m•v²/R,
where f –friction force
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].
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