Laws of Motion & Friction · JEE Main previous year questions

204 questions asked across 19 exam years, newest first

Year-wise papers Topic-wise questions

Practise this topic

2024 22 questions

Q452024 · 9 Apr 2024 · Shift 1
A light unstretchable string passing over a smooth light pulley connects two blocks of masses $m_{1}$ and $m_{2}$ . If the acceleration of the system is $\frac{g}{8}$ , then the ratio of the masses $\frac{m _{2}}{m _{1}}$ is :
1. A. $5 : 3$
2. B. $8 : 1$
3. C. $9 : 7$
4. D. $4 : 3$
Show answer
Answer: C
Q542024 · 9 Apr 2024 · Shift 2· Numerical answer
A circular disc reaches from top to bottom of an inclined plane of length $l$ . When it slips down the plane, it takes $t s$ . When it rolls down the plane then it takes $(\frac{α}{2})^{1/2} t s$ , where $α$ is ____.
Show answer
Answer: 3
Q322024 · 8 Apr 2024 · Shift 2
1. A. $6 m$
2. B. $5 m$
3. C. $1 m$
4. D. $2 m$
Show answer
Answer: D
Q392024 · 8 Apr 2024 · Shift 2
A given object takes $n$ times the time to slide down $4 5^{\circ}$ rough inclined plane as it takes the time to slide down an identical perfectly smooth $4 5^{\circ}$ inclined plane. The coefficient of kinetic friction between the object and the surface of inclined plane is :
1. A. $1 - \frac{1}{n ^{2}}$
2. B. $1 - \frac{1}{n ^{2}}$
3. C. $1 - n^{2}$
4. D. $1 - n^{2}$
Show answer
Answer: A
Q312024 · 6 Apr 2024 · Shift 2
A car of $800 kg$ is taking turn on a banked road of radius $300 m$ and angle of banking $3 0^{\circ}$ . If coefficient of static friction is 0.2 then the maximum speed with which car can negotiate the turn safely: $(g = 10 m/ s^{2}, 3 = 1.73)$
1. A. $51.4 m/s$
2. B. $102.8 m/s$
3. C. $70.4 m/s$
4. D. $264 m/s$
Show answer
Answer: A
Q462024 · 6 Apr 2024 · Shift 2
When kinetic energy of a body becomes 36 times of its original value, the percentage increase in the momentum of the body will be :
1. A.60%
2. B.500%
3. C.6%
4. D.600%
Show answer
Answer: B
Q362024 · 5 Apr 2024 · Shift 2
A heavy box of mass $50 kg$ is moving on a horizontal surface. If co-efficient of kinetic friction between the box and horizontal surface is 0.3 then force of kinetic friction is :
1. A. $1470 N$
2. B. $147 N$
3. C. $1.47 N$
4. D. $14.7 N$
Show answer
Answer: B
Q322024 · 4 Apr 2024 · Shift 2
A $2 kg$ brick begins to slide over a surface which is inclined at an angle of $4 5^{\circ}$ with respect to horizontal axis. The co-efficient of static friction between their surfaces is:
1. A.1
2. B.1.7
3. C.0.5
4. D. $\frac{1}{3}$
Show answer
Answer: A
Q312024 · 1 Feb 2024 · Shift 1
1. A.1.2
2. B.4
3. C.3
4. D.2
Show answer
Answer: D
Q342024 · 31 Jan 2024 · Shift 1
1. A.4.5 kg
2. B.6.5 kg
3. C.9 kg
4. D.2.25 kg
Show answer
Answer: A
Q362024 · 31 Jan 2024 · Shift 2
1. A. $53 N$
2. B. $\frac{5 3}{2} N$
3. C. $10 N$
4. D. $253 N$
Show answer
Answer: A
Q402024 · 31 Jan 2024 · Shift 2
A light string passing over a smooth light fixed pulley connects two blocks of masses $m_{1}$ and $m_{2}$ . If the acceleration of the system is $g /8$ , then the ratio of masses is:
1. A. $\frac{8}{1}$
2. B. $\frac{9}{7}$
3. C. $\frac{5}{3}$
4. D. $\frac{4}{3}$
Show answer
Answer: B
Q382024 · 30 Jan 2024 · Shift 1
1. A. $210 m/s$
2. B. $10 m/s$
3. C. $10 m/s$
4. D. $20 m/s$
Show answer
Answer: C
Q462024 · 30 Jan 2024 · Shift 1
1. A. $\frac{g}{2}$
2. B. $\frac{g}{4}$
3. C. $g$
4. D. $\frac{g}{3}$
Show answer
Answer: D
Q482024 · 30 Jan 2024 · Shift 1
A spherical body of mass $100 g$ is dropped from a height of $10 m$ from the ground. After hitting the ground, the body rebounds to a height of $5 m$ . The impulse of force imparted by the ground to the body is given by : (given, $g = 9.8 m/s^{2}$ )
1. A. $43.2 kg ms^{- 1}$
2. B. $2.39 kg ms^{- 1}$
3. C. $4.32 kg ms^{- 1}$
4. D. $23.9 kg ms^{- 1}$
Show answer
Answer: B
Q412024 · 29 Jan 2024 · Shift 1
A block of mass $100 kg$ slides over a distance of $10 m$ on a horizontal surface. If the co-efficient of friction between the surfaces is $0.4$ , then the work done against friction (in $J$ ) is :
1. A. $3900$
2. B. $4500$
3. C. $4200$
4. D. $4000$
Show answer
Answer: D
Q602024 · 29 Jan 2024 · Shift 1· Numerical answer
In a test experiment on a model aeroplane in wind tunnel, the flow speeds on the upper and lower surfaces of the wings are $70 ms^{- 1}$ and $65 ms^{- 1}$ respectively. If the wing area is $2 m^{2}$ , the lift of the wing is _______ $N$ . (Given density of air $= 1.2 kg m^{- 3}$ )
Show answer
Answer: 810
Q342024 · 29 Jan 2024 · Shift 2
A stone of mass $900 g$ is tied to a string and moved in a vertical circle of radius $1 m$ making $10 rpm$ . The tension in the string, when the stone is at the lowest point is (if $π^{2} = 9.8$ and $g = 9.8 m/s^{2}$ ) :
1. A. $17.8 N$
2. B. $97 N$
3. C. $9.8 N$
4. D. $8.82 N$
Show answer
Answer: C
Q362024 · 29 Jan 2024 · Shift 2
1. A. $5 : 1$
2. B. $3 : 2$
3. C. $1 : 5$
4. D. $2 : 5$
Show answer
Answer: A
Q392024 · 27 Jan 2024 · Shift 1
Two bodies of mass $4 g$ and $25 g$ are moving with equal kinetic energies. The ratio of magnitude of their linear momentum is :
1. A. $3 : 5$
2. B. $5 : 4$
3. C. $2 : 5$
4. D. $4 : 5$
Show answer
Answer: C
Q332024 · 27 Jan 2024 · Shift 2
Given below are two statements : Statement (I) : The limiting force of static friction depends on the area of contact and independent of materials. Statement (II) : The limiting force of kinetic friction is independent of the area of contact and depends on materials. In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Statement I is incorrect but Statement II is correct
2. B.Both Statement I and Statement II are correct
3. C.Both Statement I and Statement II are incorrect
4. D.Statement I is correct but Statement II is incorrect
Show answer
Answer: A
Q542024 · 27 Jan 2024 · Shift 2· Numerical answer
A ring and a solid sphere roll down the same inclined plane without slipping. They start from rest. The radii of both bodies are identical and the ratio of their kinetic energies is $\frac{7}{x}$ , where $x$ is _______.
Show answer
Answer: 7