WBJEE 2025 Laws of Motion Practice Questions with Solutions

WBJEE 2025 Laws of Motion Practice Questions: The WBJEE 2025 Laws of Motion practice questions generally feature Newton’s Laws of Motion, Kinetic Energy and Potential Energy, Inertial & Non Inertial Frames, Elastic & Inelastic Collisions, and Projectile Motion. Laws of Motion has a weightage of around 4%; you can expect around 3-4 questions from this chapter. Generally, concept-based numericals and derivations from the Laws of Motion in the WBJEE examination. Laws of Motion is an important part of the WBJEE Physics syllabus 2025. If you are preparing for the WBJEE 2025 exam , you can check the WBJEE 2025 Laws of Motion practice questions with solutions. WBJEE Laws of Motion sample questions can help you study and revise the key topics more effectively. The questions are framed to assess your understanding of the fundamental concepts and application of theories and formulae. In this article, we have shared a compilation of important and most expected WBJEE 2025 Laws of Motion practice questions with solutions to aid in exam preparation.

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List of WBJEE 2025 Laws of Motion Sub Topics for Exam Preparation

The Laws of Motion is a lengthy chapter covering several important fundamental concepts of Physics. The WBJEE 2025 syllabus PDF provides all the important sub-topics from this section. In the following table, we have listed all the sub-topics covered in the Laws of Motion chapter in the WBJEE 2025 Physics paper.

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WBJEE 2025 Laws of Motion Expected Weightage

Understanding the WBJEE 2025 Laws of Motion marks weightage will help you assess how many questions are expected in the exam from this chapter. The marks weightage helps you plan your preparation strategy as you identify the high-scoring, high weightage topics from the WBJEE 2025 Physics syllabus PDF . 3-4 questions worth one or two marks from Laws of Motion can get you a score of 4-8 marks, which is crucial in the WBJEE exam 2025. In the following table, we have provided the detailed WBJEE 2025 Laws of Motion expected weightage for your reference.

WBJEE 2025 Laws of Motion Practice Questions with Solutions

The Laws of Motion chapter features various numerical problems in WBJEE 2025, therefore, you should solve as many practice questions as possible to prepare for the exam. Here, take a look at the most expected and frequently asked WBJEE 2025 Laws of Motion practice questions with solutions.

Q1. A shell of mass 10 kg is moving with a velocity of 10 ms ^-1 when it blasts and forms two parts of mass 9 kg and 1 kg respectively. If the 1st mass is stationary, the velocity of the 2nd is:

a. 1 m/s

b. 10 m/s

c. 100 m/s

d. 1000 m/s

Ans. c. 100 m/s

Solution:

v ₁ = 10 m/s;

m ₁ = 10 kg

v ₂ = 0;

m ₂ = 9 kg

v ₃ = v;

m ₃ = 1 kg

According to the conservation of momentum

m ₁ v ₁ = m ₂ v ₂ + m ₃ v ₃

10 x 10 = 9 x 0 + 1 x v;

v = 100 m/s

Q2. The force required to move a mass of 1 kg at rest on a horizontal rough plane (μ = 0.1 and g = 9.8 m/s2) is:

a. 0.98 N

b. 0.49 N

c. 9.8 N

d. 4.9 N

Ans. a. 0.98 N

Solution:

fr = μN = μmg = 0.1 x 1 x 9.8 = 0.98 N

(Assuming that the value of  μ= 0.1 is the coefficient of static friction.), so F > 0.98 N

Q3. A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If the velocity of exhaust gas is 1 km/sec, then it lifts with an acceleration of:

a. 1000 ms ^-2

b. 100 ms ^-2

c. 10 ms ^-2

d. 1 ms ^-2

Ans. d. 1 ms ^-2

Q4. A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms-1. Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is:

a. 4 ms

b. 40 ms

c. 400 μs

d. 1 s

Ans. a. 4 ms

Solution:

To determine the approximate time the bullet spends in the barrel, we can use the kinematic equation which relates the final velocity, initial velocity, acceleration, and distance traveled:

v ² + u ² + 2as

where:

v is the final velocity

u is the initial velocity

a is the acceleration

s is the distance traveled

Given:

v = 640 ms ^-1

u = 0 ms ^-1

s = 1.2 m

Substitute these values into the kinematic equation:

6402 = 0 ² + 2xax1.2

Simplifying, we get:

409600 = 2.4a

Solving for a:

a = 409600/170666.67 = 0.00375s

Converting to milliseconds (ms):

0.00375s = 3.75 ms

Rounding to the nearest option, the approximate time the bullet spends in the barrel is 4 ms.

Q5. A golf ball of mass 50 gm placed on a tee, is struck by a golf club. The speed of the golf ball as it leaves the tee is 100 m/s, and the time of contact on the ball is 0.02 s. If the force decreases to zero linearly with time, then the force at the beginning of the contact is:

a. 100 N

b. 200 N

c. 250 N

d. 500 N

Ans. c. 250 N

Q6. Three blocks are pushed with a force F across a frictionless table as shown in the figure above. Let N ₁ be the contact force between the left two blocks and N ₂ be the contact force between the right two blocks. Then,

a. F > N ₁ >N ₂

b. F > N ₂ >N ₁

c. F > N ₁ = N ₂

d. F = N ₁ = N ₂

Ans.  F > N ₁ > N ₂

Q7. A block of mass 1 kg starts from rest at x = 0 and moves along the X-axis under the action of a force F = kt, where t is time and k = 1 Ns-1. The distance the block will travel in 6 seconds is:

a. 36 m

b. 72 m

c. 108 m

d. 18 m

Ans. 36 m

Q8. A block of mass m ₂ is placed on a horizontal table and another block of mass m ₁ is placed on top of it. An increasing horizontal force F = a _t is exerted on the upper block but the lower block never moves as a result. If the coefficient of friction between the blocks is μ ₁ and that between the lower block and the table is μ ₂ , then what is the maximum possible value of μ ₁ / μ ₂ ?

a. m ₂ /m ₁

b. 1 + m ₂ /m ₁

c. m ₁ /m ₂

d. 1 + m ₁ /m ₂

Ans. b. 1 + m ₂ /m ₁

Q9. A body of mass 2 kg moves in a horizontal circular path of radius 5 m. At an instant, its speed is 2√5 m/s and is increasing at the rate of 3 m/s2. The magnitude of the force acting on the body at that instant is:

a. 6 N

b. 8 N

c. 14 N

d. 10 N

Ans. d. 10 N

Q10. What force F is required to start moving this 10 Kg block shown in the figure if it acts at an angle of 60࿁, μs?

a. 22.72 N

b. 24.97 N

c. 25.56 N

d. None of the above

Ans. d. None of the above

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We also advise you to take chapter-wise WBJEE 2025 mock test daily as the mock questions are often similar to the WBJEE Laws of Motion sample questions. Revise all definitions, theories and formulae before attempting WBJEE 2025 Laws of Motion practice questions with solutions and track your progress regularly.

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