Uniform Circular Motion of a race car

AI Thread Summary
A 990-kg race car can navigate an unbanked turn at 42 m/s with a radius of 140 m, aided by a downforce of 12,000 N. The discussion revolves around calculating the coefficient of static friction required for this scenario and determining the maximum speed without downforce. Users express confusion about equating static friction to centripetal force and how to adjust calculations when downforce is removed. The importance of maintaining the thread's reply status is also mentioned. Clarifications on these physics concepts are sought to solve the homework problem effectively.
wizzpowa
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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??
 
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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.
 
hi wizzpowa! :smile:

do you still need help with this?

btw, never reply to your own first post …

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