Laws of Motion JEE Main Questions 2025: Important Practice Questions with PYQs

Laws of Motion JEE Main Questions 2025: The Laws of Motion chapter is one of the important topics of the JEE Main Physics syllabus. This chapter has a decent weightage in the JEE Mains 2025 exam as per last year's trends. Candidates should solve the questions and evaluate their performance. Preparing all the chapters with high weightage properly will help the candidate score well on the JEE Main exam. The authorities will soon release the syllabus for the JEE Main 2025. Some of the Laws of Motion topics from which questions can be asked are Force & Inertia, Newton’s first/second/third Law of Motion, the Law of Conservations of Linear Momentum (its applications), Concurrent forces and Equilibrium, Kinetic and Static Friction, and Laws of Fiction, and others.

Students should solve all the questions provided here to practice the Laws of Motion chapters from the Physics Syllabus of JEE Main 2025 . Before we move on to the important questions for this chapter, have a look at the topics that need to be focused on while studying this chapter.

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What To Study in Laws of Motion?

Here are the topics that applicants should not miss while their preparation for this chapter.

1. Force & interia
2. First/second/third law of Newton
3. Momentum
4. Impulses
5. Law of conservation of linear momentum (its applications)
6. Concurrent forces and equilibrium
7. Laws of friction
8. Kinetic and static friction
9. Rolling friction
10. Uniform circular motion dynamics
11. Centripetal force (its applications)

JEE Main Laws of Motion Important Questions 2025

Check the practice important questions from previous years for the chapters ‘laws of motion.’

1. While peddling a bicycle, the force of friction exerted by the ground on the two wheels is such that it acts

• in the backward direction on the front wheel and in the forward direction on the rear wheel
• in the forward direction on the front wheel and in the backward direction on the rear wheel
• in the backward direction on both the front and rear wheels
• in the forward direction on both the front and rear wheels

Correct Answer: (a)

2. A car is moving in a circular horizontal track of radius 10 m with a constant speed of lOm/s. A plumb bob is suspended from the roof of the car by a light, rigid rod. The angle made by the rod with the track is (g = 10 m/s2).

• zero
• 30°
• 45°
• 60

Correct Answer: (c)

3. A block of mass 0.1 kg is held against a wall, applying a horizontal force of 5N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is

• 2.5N
• 0.98N
• 4.9N
• 0.49N

Correct Answer: (a)

4. A block of mass 2 kg rests on a rough inclined plane, making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is

• 9.8 N
• 0.7 x 9.8 x√3N
• 9.8 x √3N
• 0.7 x 9.8 N

Correct Answer: (a)

5. A ship of mass 3 x 107 kg initially at rest is pulled by a force of 5 x 104 N through a distance of 3 m. Assuming that the resistance due to water is negligible, the speed of the ship is

• 1.5m/s
• 60 m/s
• 0.1 m/s
• 5 m/s

Correct Answer: (c)

6. If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that

• linear momentum of the system does not change in time
• the kinetic energy of the system does not change in time
• angular momentum of the system does not change in time
• the potential energy of the system does not change in time

Correct Answer: (a)

7. A piece of wire is bent in the shape of a parabola y = kx2 (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the y-axis is

• a/gk
• a/2gk
• 2a/gk
• a/4gk

Correct Answer: (b)

8. Two blocks of mass m1 = 10kg and m2 = 5kg, connected to each other by a massless, inextensible string of length 0.3 m, are placed along the diameter of a turntable. The coefficient of friction between the table is 0.5, while there is no friction between rr^ and the table. The table is rotating with an angular velocity of lOrad/s about a vertical axis passing through its center O. The masses are placed along the diameter of the table on either side of the center O such that the mass m1 is at a distance of 0.124m from O.The masses are observed to be at rest with respect to an observer on the turntable.

• Calculate the frictional force on m1.
• What should be the minimum angular speed of the turntable so that the masses will slip from this position?
• How should the masses be placed with the string remaining taut so that there is no frictional force acting on the mass m1?

Correct Answer: (a)

9. As per the given figure, a weightless pulley P is attached to a double-inclined frictionless surface. The tension is the string (massless) will be (if g = 10m/s2)

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

Correct Answer: (b)

10. Two bodies of mass m1=5kg and m2=3Kg are connected by a light string going on a smooth light pulley a smooth inclined plane as shown in the figure. The system is at rest. The force exerted by the inclined plane on the body of mass m1 will be:

• 30 N
• 40 N
• 50 N
• 60 N

Correct Answer: (b)

11. Two masses of m1=5kg and m2=10kg connected via an inextensible string over a frictionless pulley are moving as shown in the figure. The coefficient of friction of a horizontal surface is 0.15. The minimum weight m that should be put on top of m2 to stop motion is:

• 18.3 g
• 23.3 g
• 43.3 g
• 10.3 g

12. A body is thrown vertically upwards. Which one of the following graphs correctly represents the velocity vs time?

Applicants can judge their performance before the JEE Main 2025 by solving these questions above. For more such updates, stay tuned with CollegeDekho.

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