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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Yognarayan posted an Question
July 01, 2020 • 04:47 am
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30 points
30 points
- IIT JAM
- Physics (PH)
7. two cars of unequal masses use similar tyres. if they are moving at the same initial speed, the minimum stopping distance (a) is smaller for the heavier car
7. Two cars of unequal masses use similar tyres. If they are moving at the same initial speed, the minimum stopping distance (a) is smaller for the heavier car (b) is smaller for the lighter car (c) is same for both cars (d) depends on the volume of the car. 8. In order to stop a car in shortest distance on a horizontal road, one should (a) apply the brakes very hard so that the 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.
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Himanshu Pandey
For the 8th question answer should be option B as we know that static friction is always greater than kinetic friction that's why when you apply enough break the velocity of lower most point of the wheel is zero that's why is stop easily
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Yognarayan
okk 😊
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Ruby negi
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apply friction concept on ques 7.. using this u will find same acceleration for both . therefore acceleration, Velocity is same so distance will also same... u r right option c is correct... but I have no idea for ques 8.. i'll give u ans tommorow for ques 8
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Ruby negi
8.option a is correct according to me.
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Himanshu Pandey
one more thing I want to clarify here is that you can be confuse by option A so in that particular option kinetic friction will be greater than the static friction here I mean to say that is when you stop the car then wheel will start sliding because of kinetic energy and it would not be stop suddenly so B Feel free to ask