Circular Motion while learning to drive

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Homework Help Overview

The discussion revolves around a scenario involving circular motion while learning to drive, specifically focusing on the dynamics of a car approaching a wall in a parking lot. The original poster presents a situation where a car is moving at a certain speed and questions the maximum horizontal force that can be exerted by the pavement, as well as the implications of road surface roughness on this force.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the nature of the force acting on the car and its relation to circular motion. Questions are raised about the role of surface roughness in determining the maximum force and the implications of steering and braking on collision avoidance distances.

Discussion Status

The discussion is ongoing, with participants questioning the relationship between the forces involved and the mechanics of circular motion. Some guidance has been offered regarding the centripetal force when turning the steering wheel, but no consensus has been reached on the various questions posed.

Contextual Notes

Participants are navigating the complexities of driving dynamics, including the effects of braking and steering on collision avoidance. There is an acknowledgment of potential language barriers affecting communication.

haha1234
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Homework Statement



While learning to drive,you are in a 1200 kg car moving at 20.0m/s across a large,vacant,level parking lot.Suddenly you realize you are heading straight toward the brick sidewall of a large supermarket and are in danger of running into it.The pavement can exert a maximum horizontal force of 7000N on the car.
Explain why you should expect the force to have a well-defined maximum value.

Homework Equations


The Attempt at a Solution


The answer state that the maximum value determined by the surface roughness.Why the roughness of the road make the force well-defined?
 
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What kind of force do you think is stopping the car?

(What does this question have to do with circular motion?)
 
Doc Al said:
What kind of force do you think is stopping the car?

(What does this question have to do with circular motion?)

ioc.
And i want ask another question,why the minimum distance required to avoid collision when not applying brakes and turning the steering wheel is twice as that of applying brakes and not turning the steering wheel?
Sorry for my poor English and I hope that you can understand what I mean.:shy:
 
haha1234 said:
ioc.
?

And i want ask another question,why the minimum distance required to avoid collision when not applying brakes and turning the steering wheel is twice as that of applying brakes and not turning the steering wheel?
Figure out the required distance in each case and see for yourself! Hint: When turning the wheel, the force is centripetal.
 
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