What Is the Best Way to Apply Brakes to Stop a Car Quickly?

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Homework Help Overview

The discussion revolves around the optimal method for applying brakes to stop a car quickly on a horizontal road, referencing a problem from HC Verma's Concepts of Physics.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • Participants explore different braking techniques, including hard braking, preventing wheel slip, pumping brakes, and shutting off the engine. The original poster asserts that preventing slipping (option b) is the correct approach but seeks clarification on why this is the case.

Discussion Status

Some participants are engaged in questioning the reasoning behind the choice of option b, while others are attempting to clarify the concepts of static versus kinetic friction in the context of braking efficiency. There is a recognition of the need for deeper understanding rather than a straightforward solution.

Contextual Notes

The original poster expresses difficulty in understanding the underlying concepts, indicating a potential gap in knowledge that may affect their ability to articulate the reasoning behind the correct answer.

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In order to stop a car in shortest distance on a horizontal road, how should one apply brakes?

(a) apply the brakes very hard so that wheels stop rotating.
(b) apply the brakes hard enough to just prevent slipping
(c) pump the brakes( press and release)
(d) shut the engine off and not apply brakes.

I know the answer is (b). Please give a solution of it so as to why (b) is the answer.

Its an objective problem of HC Verma Concepts of Physics.
 
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Why don't you give it a try and explain it to us?
 
I want to but am not able to. m not understanding the concept it seems. Please let me know of this.
 
the reason for choosing B is that to stop the car in a shortest distance, we generally use static friction instead of kinetic friction. The static friction is produced when we are not allow the tires slipping through the road, in this way, the car experiences the maximum friction. For kinetic friction, the tires sliding across the road would produce less friction to stop the car. To review why static friction is bigger than kinetic friction, please read through textbook.

Thanks,
 

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