JEE Mains 2023 Laws of Motion PYQs with Solutions | Chapterwise Previous Year Questions

📘 Struggling with Laws of Motion for JEE Mains 2024?

Practice the most important JEE Mains 2023 Laws of Motion PYQs with clear and detailed solutions. 💡 This quick chapterwise guide will help you boost concept clarity, improve problem-solving speed, and score higher in your exam. 🚀 Start your smart revision now and stay ahead of the competition!

Question 1.

 A block of mass 5 kg is placed at rest on a table of rough surface. Now, if a force of 30N is applied in the direction parallel to surface of the table, the block slides through a distance of 50 m in an interval of time 10s. Coefficient of kinetic friction is (given, g = 10 m/s^2):

(1) 0.60
(2) 0.75
(3) 0.50
(4) 0.25

Answer . (3)

Question 2.

 As shown in the figure a block of mass 10 kg lying on a horizontal surface is pulled by a force F acting at an angle 30°, with horizontal. For μs = 0.25, the block will just start to move for the value of F: [Given g = 10 m/s^2.]

(1) 33.3 N 
(3) 20 N
(2) 25.2 N
(4) 35.7 N

Answer .(2)

Question 3.

Answer . (b)

Question 4.

Given below are two statements :
Statement-I : An elevator can go up or down with uniform speed when its weight is balanced with the tension of its cable.
Statement-II : Force exerted by the floor of an elevator on the foot of a person standing on it is more than his/her weight when the elevator goes down with increasing speed.
In the light of the above statements, choose the correct answer from the options given below : 
(1) Both statement I and statement II are false.
 (2) Statement I is true but Statement II is false .
(3) Both Statement I and Statement II are true .
(4) Statement I is false but Statement II is true.

Answer . (2)

Question 5.

As per given figure, a weightless pulley P is attached on a double inclined frictionless surface. The tension in the string (massless) will be (if g = 10 m/s^2.)

(1) (4√3+1)N
(3) 4(√3-1)N
(2) 4(√3 +1)N
(4) (4√3-1)N

Answer . (2)

Question 6.
 Consider a block kept on an inclined plane (inclined at 45°) as shown in the figure. If the force the coefficient of friction between the block and inclined plane (μ) is equal to :

(1) 0.33
(2) 0.60
(3) 0.25
(4) 0.50

Answer . (a)

Question 7.
 A block of mass m slides down the plane inclined at angle 30° with an acceleration g/4 The value of coefficient of kinetic friction will be :

(1) 2√3+1 / 2
(2)  1/2√3
(3) √3/2
(4) 2√3-1/2

Answer . (2)

Question 8.
The time taken by an object to slide down 45° rough inclined plane is n times as it takes to slide down a perfectly smooth 45° incline*plane. The coefficient of kinetic friction between the object and the incline plane is

Answer . (4)

Question 9.
A force acts for 20 s on a body of mass 20 kg, starting from rest, after which the force ceases and then body describes 50 m in the next 10 s. The value of force will be:
(1) 40 N
(3) 20 N
(2) 5 N
(4) 10 N

Answer . (2)

Question 10.
 The figure represents the momentum time (p-t) curve for a particle moving along an axis under the influence of the force. Identify the regions on the graph where the magnitude of the force is maximum and minimum respectively?
If (t3-t2)< t1.

Answer . (2)

Question 11.

A block of √3 kg is attached to a string whose other end is attached to the wall. An unknown force F is applied so that the string makes an angle of 30° with the wall. The tension T is :
(Given g = 10 m/s^2)

(1) 20N
(2) 25N
(3) 10N
(4) 15N

Answer . (1)

Question 12.
As shown in figure, a 70 kg garden roller is pushed with a force of F = 200 N at an angle of 30° with horizontal. The normal reaction on the roller is
(Given g = 10 m/s^2.)

(1) 800√2

(2) 600

(3) 800

(4) 200√3

Answer . (c)

Question 13.

100 balls each of mass m moving with speed v simultaneously strike a wall normally and reflected back with same speed, in time t s. The total force exerted by the balls on the wall is

(1) 100mv/t
(2) 200mv/t
(3) 200mvt
(4) mv/100t

Answer . (2)

Question 14.

 A body of mass 10 kg is moving with an initial speed of 20 m/s. The body stops after 5 s due to friction between body and the floor. The value of the coefficient of friction is: (Take acceleration due to gravity g = 10 m/s^2.)

(1) 0,2
(3) 0.5
(2) 0.3
(4) 0.4

Answer . (d)