• 100% Satisfaction Guarantee
CarDoc, Independent European Shop owner
Category: Car
Satisfied Customers: 6455
Experience:  20 years of experience working with European cars. Independent European shop owner and technician.
14582033
CarDoc is online now

# Fargason: Why is the centripetal force of a car going around

Why is the centripetal force of a car going around a curve equal to the static frictional force? I got this from my physics class, but I don't understand the actual physical meaning. If there is a static frictional force pointing towards the center of the curve, that has to mean that there is a force pushing in the opposite direction to the curve that the static frictional force is opposing, but I don't know what that is.

CarDoc :

Hello, I'm Jason. I will do my best to answer your question quickly and accurately using the information you have provided.

CarDoc :

The centripetal force is only equal to the static frictional force to a point, that point being where the tires lose adhesion...

CarDoc :

in most cases of regular road cars, this force is going to be about .80-.90g

CarDoc :

the opposite force is going to be centrifugal force, meaning a vector pointing from the apex of the corner, outward

CarDoc :

I'd like to keep this chat open, if you're able to access it, otherwise I'll change to standard email format

CarDoc :

please let me know if you have further questions. Switching formats now

CarDoc, Independent European Shop owner
Category: Car
Satisfied Customers: 6455
Experience: 20 years of experience working with European cars. Independent European shop owner and technician.
Customer: replied 3 years ago.

When you say that the tires loose adhesion at 0.8-0.9 grams, (Is it grams?) where are you getting numbers? Do they relate to vectors pointing out from the center of the circle? Is that how people find the coefficients for static and kinetic friction?

Not grams. G=force of gravity. 1 g lateral, would be a force vector pointing from the apex of the circle outward, perpendicular to the force of gravity.

The numbers are going to be different for every car and every tire. We'll take 2 extremes.
1975 Buick Electra, on period-correct tires, can generate a maximum of approximately 0.60g lateral
2012 Renault Formula 1 car can generate about 4-5 g lateral.

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

### What Customers are Saying:

• I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Previous | Next >
• I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
• used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. \$15.00 "tracer" fee and \$40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
• 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
• As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!
Sue Charleston, WV
• Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
• Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA

• ### Chris (aka-Moose)

#### Satisfied Customers:

1006
16 years of experience
< Last | Next >

### Chris (aka-Moose)

#### Satisfied Customers:

1006
16 years of experience

### Ted G.

#### Satisfied Customers:

1694
20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

### George H.

#### Satisfied Customers:

1447
ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

### GM Tech (Cam)

#### Satisfied Customers:

669
GM Grand Master Technician 2007. 14 years experience.

### Amedee

#### Satisfied Customers:

2406
ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

### Jerry

#### Satisfied Customers:

2123
ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager