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Ask iit jee aieee pet cbse icse state board experts Expert Question: friction concept applying car brakes
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prakhar_galaxy (501)

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Q. In order to stop a car in shortest distance on ahorizontal road ,one shud
a.apply the brakes very hard so dat the wheels stop rotating
b.apply the brakes hard enough to just prevent slipping
c.pump the brakes (press& release)
d.shut the engine off
 
the answer given in hcv is b
But i am not understanding it how
so sir plz explain me the concept how brakes act in the car & justification of this answer

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edison (4435)

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The option b seems to be more logical.

As applying brakes too hard will imply the wheels will stop rotating but due to the momentum of the vehicle and limited coefficient of friction between tyre and road the translational motion will not cease due to slipping of the vehicle and thus lipping of vehicle will prevent vehicle to stop.

The most incomprehensible thing about the world is that it is

at all comprehensible.
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prakhar_galaxy (501)

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but sir dat much i know when we apply the brakes it locks the wheels means it stops the rotation of the tyre
then how will we be able to stop the slipping of tyres by applying the brakes coz they can stop rotation of tyres only
plz explain it
anyone else can also solve it
plz it's urgent

PLZ DONT RATE ME FOR MY ANSWERS,IF U WANT TO COMPLIMENT ME THEN JUST HELP ANY OTHER IN FUTURE AS I AM DOING IT NOW

FILL THE UNFORGIVING MINUTE WITH 60 SECONDS THEN THE LIFE WILL BE YOURS

The woods are lovely, dark &deep
But I have promises to keep
And miles to go before I sleep
And miles to go before I sleep
-Robert Frost
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prakhar_galaxy (501)

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sir plz reply to it
any other expert plzzz

PLZ DONT RATE ME FOR MY ANSWERS,IF U WANT TO COMPLIMENT ME THEN JUST HELP ANY OTHER IN FUTURE AS I AM DOING IT NOW

FILL THE UNFORGIVING MINUTE WITH 60 SECONDS THEN THE LIFE WILL BE YOURS

The woods are lovely, dark &deep
But I have promises to keep
And miles to go before I sleep
And miles to go before I sleep
-Robert Frost
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satishrm (10)

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U HAVE TO STUDY ROLLING MOTION IN DETAIL..............TAKE A NICE BOOK LIE RESNICK & HALLIDAY......ELSE NOONE CAN HELP U
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