(adsbygoogle = window.adsbygoogle || []).push({});

SOLVED

(Green means correct)

1. The problem statement, all variables and given/known data

A a 14600 kg *rubber-tired car moves on a concrete highway curve of radius 71 m is banked at a 12° angle.

(a) What is the normal force acting on the car?

168971N

(b) What is the speed with which the car can take this curve without sliding? (Assume s = 0.)

m/s

2. Relevant equations

2nd law statements

a= V^2/ r

3. The attempt at a solution

So I began part a by drawing force diagrams and then 2nd law statements. I was left with:

n= mg/ cos@

n= (14600)/ cos12

n=168971

That was correct. I then attempted to move along to part b. I began this by saying that the total force is static friction, therefore:

Fs(the maximum)= Mass(V(maximum)^2)/r

V^2= (mu)*gr

However, with mu=0 then this all totals to zero. I'm not sure how to get around this. Plus, logically if the coefficient of static friction is zero, then no matter what wouldn't the car slide??

Thanks in advance!

~Phoenix

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Banked Curve- find the Velocity when static MU=0

**Physics Forums | Science Articles, Homework Help, Discussion**