Uniform Circular Motion of a race car

[wizzpowa]

Homework Statement

A 990-kg race car can drive around an unbanked turn at a maximum speed of 42 m/s without slipping. The turn has a radius of 140 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of 12000 N on the car. (a) What is the coefficient of static friction between the track and the car's tires? (b) What would be the maximum speed if no downforce acted on the car?

Homework Equations

F s (max) = v squared / r
Fn - mg - Fd = 0

The Attempt at a Solution

So i got the normal force, but I am so confused on how to get Fs max. Isn't it equal to the centripetal force??

 

[wizzpowa]

Also, for part B, I know you just have to make the downforce equal to zero, but i am not sure how to find V.

 

[tiny-tim]

hi wizzpowa!

do you still need help with this?

btw, never reply to your own first post …

it takes the thread off the No-Replies list! ​