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Friction - JEE Main Previous Year Questions with Solutions

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Q. A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is- (1) 20 N (2) 50 N (3) 100 N (4) 2 N [AIEEE - 2003]
Ans. (4)
Q. A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10s. Then the coefficient of friction is- (1) 0.02        (2) 0.03       (3) 0.06       (4) 0.01 [AIEEE - 2003]
Ans. (3)
Q. A block rests on a rough inclined plane making an angle of $30^{\circ}$ with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of the block (in kg) is : (taken $\left.\mathrm{g}=10 \mathrm{m} / \mathrm{s}^{2}\right)$ (1) 2.0          (2) 4.0           (3) 1.6           (4) 2.5 [AIEEE - 2004]
Ans. (1)
Q. A smooth block is released at rest on a $45^{\circ}$ incline and then slides a distance d. The time taken to slide is n times as much to slide on rough incline than on a smooth incline. The coefficient of friction is- $(1) \mu_{\mathrm{k}}=1-\frac{1}{\mathrm{n}^{2}}$ $(2) \mu_{\mathrm{k}}=\sqrt{1-\frac{1}{\mathrm{n}^{2}}}$ (3) $\mu_{\mathrm{s}}=1-\frac{1}{\mathrm{n}^{2}}$ (4) $\mu_{\mathrm{s}}=\sqrt{1-\frac{1}{\mathrm{n}^{2}}}$ [AIEEE - 2005]
Ans. (1)
Q. The upper half of an inclined plane with inclination $\phi$ is perfectly smooth, while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom, if the coefficient of friction for the lower half is given by- (1) $2 \sin \phi$ (2) $2 \cos \phi$ (3) 2 tan $\phi$ (4) $\tan \phi$ [AIEEE - 2005]
Ans. (3)
Q. Consider a car moving on a straight road with a speed of 100 m/s. The distance at which car can be stopped, is : $\left[\mu_{\mathrm{k}}=0.5\right]$ (1) 800 m          (2) 1000 m         (3) 100 m           (4) 400 m [AIEEE - 2005]
Ans. (2)
Q. The minimum force required to start pushing a body up a rough (frictional coefficient $\mu$) inclined plane is $\mathrm{F}_{1}$ while the minimum force needed to prevent it from sliding down is $\mathrm{F}_{2}$. If the inclined plane makes an angle $\theta$ from the horizontal such that $\tan \theta$ = $2 \mu$then the ratio $\frac{\mathrm{F}_{1}}{\mathrm{F}_{2}}$ is :- (1) 4 (2) 1 (3) 2 (4) 3 [AIEEE - 2011]
Ans. (4) $=\frac{2 \mu+\mu}{2 \mu-\mu}=\frac{3 \mu}{\mu}=3$
Q. A block of mass m is placed on a surface with a vertical cross section given by $\mathrm{y}=\frac{\mathrm{x}^{3}}{6}$ . If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is :- (1) $\frac{1}{3} \mathrm{m}$ (2) $\frac{1}{2} \mathrm{m}$ (3) $\frac{1}{6} \mathrm{m}$ (4) $\frac{2}{3} \mathrm{m}$ [jee-main-2014]
Ans. (3) For equilibrium under limiting friction $\operatorname{mg} \sin \theta=\mu \operatorname{mg} \cos \theta$ $\Rightarrow \tan \theta=\mu$ From the equation of surface $y=\frac{x^{3}}{6}$ slope $=\frac{d y}{d x}=\frac{3 x^{2}}{6}=\tan \theta$ $\Rightarrow \frac{\mathrm{x}^{2}}{2}=\mu=0.5 \Rightarrow \mathrm{x}=1$ So $\mathrm{y}=\frac{1}{6}$
Q. Given in the figure are two blocks A and B of weight 20 N and 100 N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is :- (1) 120 N (2) 150 N (3) 100 N (4) 80 N [jee-main-2015]
Ans. (1) for equllibrrium of A $\mathrm{f}_{1}=20$ for equllibrrium of B $\mathrm{f}_{2}=\mathrm{f}_{1}+100$ $\mathrm{f}_{2}=120 \mathrm{N}$
Q. Two masses $\mathrm{m}_{1}$ = 5kg and $\mathrm{m}_{2}$ = 10kg, connected by an inextensible string over a frictionless pulley, are moving as shown in the figure. The coefficient of friction of horizontal surface is 0.15. The minimum weight m that should be put on top of $\mathrm{m}_{2}$ to stop the motion is :- (1) 27.3 kg (2) 43.3 kg (3) 10.3 kg (4) 18.3 kg [JEE-(Mains) - 2018]
Ans. (1)

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Comments

Rudra Singh
Jan. 3, 2024, 6:35 a.m.
sir i didnt understand the sollution of first question please can you provide video sollution of this
Krish
Sept. 30, 2023, 6:35 a.m.
Pls provide a PDF of these questions
Mr hacker
Oct. 20, 2023, 12:33 p.m.
Ok
Krish
Sept. 30, 2023, 6:35 a.m.
Pls provide a PDF of these questions
Chetan parihar
Sept. 15, 2023, 3:48 p.m.
These questions are midrange
Simran
June 17, 2023, 6:35 a.m.
Hello
Safa
Sept. 24, 2021, 10:31 p.m.
Best for jee aspirants
fuck off esaral
April 29, 2021, 1:40 p.m.
Useless questions just for beginners these are the simplest questions selected from different years these kind of question are not going to come in your jee prep or jee advanced or even mains
bjjugu
Feb. 4, 2021, 1:47 p.m.
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Himanshi saxena
Jan. 22, 2021, 5:16 a.m.
Great help thanks alot
Priyanshu
Jan. 10, 2021, 1:18 p.m.
Thanxs sir....
Roshni
Jan. 10, 2021, 10:24 a.m.
Nice questions can you give such more questions
Aashika sharma
Dec. 29, 2020, 10:58 p.m.
It is so helpful for a jee aspirant.
Aayush
Dec. 28, 2020, 3:23 p.m.
Very good questions thanks a lot
Sunil
Dec. 20, 2020, 12:15 a.m.
Nice sir
Shreyansh
Dec. 10, 2020, 11:46 a.m.
Good
Prashant
Nov. 10, 2020, 9:14 p.m.
Nice questions
Prashant
Oct. 25, 2020, 1:25 p.m.
Please correct the option (1)
Anshul
Oct. 11, 2020, 8:30 p.m.
Thanks . Please update it
imemyself
Oct. 10, 2020, 8:11 p.m.
good practice questions !!!
Asha
Sept. 27, 2020, 10:10 p.m.
Could you please keep many more previous year questions topic wise.
me
Sept. 23, 2020, 5:43 p.m.
nikl
CHANDRA SAILESH
Sept. 14, 2020, 7:27 a.m.
Thank you very good questions
SHARATH
Sept. 12, 2020, 11:36 a.m.
EASY QUESTIONS FOR JEE MAINS
Venkanna
Sept. 11, 2020, 7:49 p.m.
Can u plz upload past 2 papers of mains
Nikitha
Sept. 8, 2020, 3:55 p.m.
Good
Xyz
Aug. 14, 2020, 10:58 p.m.
Option in last question is wrong, correct it.
Manas
Aug. 12, 2020, 9:11 a.m.
Graeat work
Sudheer
Aug. 11, 2020, 1:54 p.m.
Good revision
LAXMI PRASANNA ANNEPU
Aug. 9, 2020, 5:54 p.m.
It was really helpful.
Esther Evangeline
Aug. 7, 2020, 1:47 p.m.
Thanks for your effort
manu
Aug. 5, 2020, 11:01 p.m.
sir,the 4 th qs soln has one error,its g/root 2 and not g/12
ayush
July 22, 2020, 12:53 p.m.
it was really helpful ....i enjoyed a lot
VARUN DUBE
July 12, 2020, 11:06 a.m.
Thanks, IT WAS REALLY HELPFUL..!! HERE, I got the most popular and most frequently seen questions..!! THANKS FOR THE FAQs provided ...!!!!
Bindu
July 11, 2020, 3:40 p.m.
Less question can't able to practice well because still didnt expose to many questions
Anubhav
July 7, 2020, 5:45 a.m.
The answer of the last question is not matching with the options . Solution is right but it is not in the option . please correct it.
Ankur
June 3, 2020, 3:01 p.m.
Best site
Nikki
May 27, 2020, 9:59 a.m.
Good
Madhusudan Das
May 15, 2020, 2:02 p.m.
Good
panakj
May 9, 2020, 5:31 a.m.
good
jappos
May 4, 2020, 1:26 p.m.
v good
sai bharath
April 28, 2020, 5:31 p.m.
good
M. Gowtham
April 15, 2020, 1:04 p.m.
Good
sam
April 3, 2020, 1:33 p.m.
hi
varad
March 22, 2020, 11:43 a.m.
thank you
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