Uniform circular motion (I DON'T KNOW)

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Homework Help Overview

The discussion revolves around a problem in uniform circular motion, specifically calculating the maximum speed of a car rounding a turn given its mass, the radius of the turn, and the coefficient of static friction between the tires and the road.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to calculate the maximum speed using forces and acceleration, while others suggest using the relationship between centripetal acceleration and speed.

Discussion Status

Participants are exploring different methods to approach the problem, with some providing formulas and others questioning the assumptions made regarding forces and acceleration. There is an ongoing exchange of ideas without a clear consensus on the correct method.

Contextual Notes

Participants are discussing the implications of the flat surface and the direction of forces, as well as the relevance of time in the calculations. There are references to external resources for further clarification.

heelp
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WHAT IS THE MAXIMUM SPEED WITH WHICH A 1050KG CAR CAN ROUND A TURN OF RADIUS 77M ON A FLAT ROAD IF THE COESFFIECENT OF STATIC FRICTION BETWEEN TIRES AND ROAD IS .80? here is what I have so far?

m= 1050kg
r =77m
uk =.080
FN=mg FR =ukfn
(1050kg)(9.8m/s) = FN = 10290N
(.80) (10290) = 8232N= FR
A= F/m a=10290N + 8232N/1050 17.64M/S^2
SPEED = X/T 77/17.64 =4.4m/s
Not sure am I right?
 
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At max speed:
F_s = ma
F_s = u_s * N = u_s*mg

Remember that a = v^2/r and solve for v.
 
reply

v= squre root of (9.8m/s^2)(77m) = is the maxium speed 27.46m/s
 
Last edited:
You don't need to know time.

F_s = ma

You know F_s, you know m and you know that a = v^2/r
 
[
heelp said:
v= squre root of (9.8m/s^2)(77m) = is the maxium speed 27.46m/s

Why did you use acceleration = 9.80 m/s/s ?
The car is on a flat surface with acceleration directed along the x-axis. This causes the car to move forward. Force of gravity acts on the y-axis pulling an object downward.

u6l2a1.gif
http://www.physicsclassroom.com/Class/circles/U6L2a.html
 
Last edited:
is F_S IS TOTAL Force
 
heelp said:
is F_S IS TOTAL Force

Fnet is simply the sum of all the forces.

Please read this. I'm sure that will help you. Pay special attention to those examples.
 

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