NTA will shortly release the JEE Main Syllabus 2025 at jeemain.nta.ac.in. Last Year, the complete syllabus of JEE Main underwent some major changes. According to the latest syllabus guidelines, the weightage of Physics has dropped to 22.5%. Due to these changes in the syllabus, certain shifts in chapter-wise weightage have been observed. Laws of Motion are among such topics. It’s among the least weightage topics in JEE Main Physics Syllabus 2025. This chapter holds 1.39% weightage in the whole syllabus.
- Laws of Motion is a part of the General Physics section, and every year around 2-3 questions are asked from this chapter. Due to the drop in weightage, you can expect 1-2 questions in JEE Main 2025.
- Laws of Motion in JEE Mains Physics Syllabus 2025 covers all the basic concepts on units and measurements, fundamentals of units, dimensions etc.
Aspirants consider Laws of Motion as one of the Easiest Chapters in Physics for JEE Main 2025. Even though this chapter has the least weightage in the syllabus, to develop a strong foundation in physics, this particular chapter plays a pivotal role. Hence the candidates need to develop a clear understanding of this chapter. The list of most asked questions from this chapter will help the students with their preparation.
Must Check News on JEE Main Physics:
Here are some important topics to know about the laws of motion for the JEE Main exam:
- Newton's laws of motion
- These three laws describe the relationship between an object's motion and the forces acting on it. The laws are:
- Inertia: An object will remain at rest or move in a straight line at a constant speed unless acted upon by an external force
- Force and acceleration: The net force on an object is equal to its mass multiplied by its acceleration
- Action and reaction: For every action, there is an equal and opposite reaction
- Other concepts
- Other important concepts include equilibrium, circular motion, impulse and momentum, collisions, relative motion, and more
- Preparation
- Solving important questions can help you feel more confident and prepared on the exam day
Laws of Motion JEE Mains Questions -
List Of Most Asked Questions With Solutions
In the (JEE) Main, the topic of Laws of Motion often features questions that have appeared multiple times in previous years. Many questions in this section are either repeated or follow similar patterns, with only minor changes, such as different numerical values or slight modifications in wording.Certain questions have been repeated as many as five times.
Here are some of the most frequently asked and repeated questions:
Question 1 : A block of mass 2 kg is placed on a rough horizontal surface with a coefficient of static friction 
- (A) 10 N
- (B) 9.8 N
- (C) 5 N
- (D) 0 N
Question 2: Two blocks of masses 4 kg and 6 kg are placed on a frictionless surface. A force of 30 N is applied to the 4 kg block. What is the acceleration of the system and the force exerted by the 4 kg block on the 6 kg block? (This question has been asked thrice-17 Mar 2021 Shift 2,JEE Main 2020,JEE Main 2022 )
- (A) 3 m/s2, 18 N
- (B) 5 m/s2, 12 N
- (C) 3 m/s2, 12 N
- (D) 2 m/s2, 18 N
Question 3 : A block of mass 5 kg is kept on an inclined plane making an angle of 30° with the horizontal. The coefficient of friction between the block and the plane is μ=0.2 . What is the frictional force acting on the block? (Take g=10 m/s2). (This question has been asked thrice- JEE Main 2014,JEE Main 2016,JEE Main 2019 )
- (A) 2 N
- (B) 5 N
- (C) 8.66 N
- (D) 10 N
Question 4: Two blocks of masses m1=3 kg and m2=5 kg are connected by a light inextensible string that passes over a frictionless pulley. The block m1 is on a frictionless table and m2 is hanging vertically. Find the acceleration of the system and the tension in the string.
(Take g=10 m/s2)
(This question has been asked thrice-JEE Main 2021,JEE Main 2018,JEE Main 2017 )
- (A) 5 m/s2, 30 N
- (B) 4 m/s2, 20 N
- (C) 2.5 m/s2, 15 N
- (D) 1 m/s2, 5 N
Question 5 : A person of mass 60 kg is standing on a weighing machine in a lift. The lift is accelerating upwards with an acceleration of 2 m/s2. What will be the reading on the weighing machine? (Take g=10 m/s2) (This question has been asked thrice-JEE Main 2021,JEE Main 2018,JEE Main 2019 )
- (A) 720 N
- (B) 600 N
- (C) 840 N
- (D) 900 N
Question 6 : A block of mass 10 kg is pulled with a force of 60 N at an angle of 30∘ with the horizontal on a rough surface. The coefficient of kinetic friction between the block and the surface is 0.5. What is the acceleration of the block? (Take g=10 m/s2)
(This question has been asked thrice-JEE Main 2021,JEE Main 2017,JEE Main 2013 )
- (A) 0.8 m/s2m/s^2m/s2
- (B) 1.5 m/s2m/s^2m/s2
- (C) 2.0 m/s2m/s^2m/s2
- (D) 2.5 m/s2m/s^2m/s2
Question 7 : Question: A block of mass 4 kg rests on a horizontal surface. A horizontal force of 12 N is required to just move the block. What is the coefficient of static friction between the block and the surface? (Take g=10 m/s2)
(This question has been asked twice-JEE Main 2015,JEE Main 2024 )
- (A) 0.2
- (B) 0.3
- (C) 0.4
- (D) 0.5
Question 8 : A block of mass 5 kg is placed on a smooth inclined plane making an angle of 60° with the horizontal. What is the acceleration of the block down the plane?
(Take g=10 m/s2)
(This question has been asked twice-JEE Main 2015,JEE Main 2021 )
Question 9 : A body of mass 10 kg is moving with a constant velocity of 2 m/s. A force of 50 N is applied in the direction of motion. What will be the acceleration of the body? (Neglect friction)
(This question has been asked thrice-17 Mar 2021 Shift 2,JEE Main 2019,JEE Main 2022 )
- (A) 4 m/s2
- (B) 5 m/s2
- (C) 6 m/s2
- (D) 10 m/s2
Question 10 : A block of mass 10 kg is kept on a horizontal surface and a force of 50 N is applied at an angle of 30° with the horizontal. The coefficient of friction between the block and the surface is 0.2. Will the block move and what will be the frictional force acting on it? (Take g=10 m/s2) (This question has been asked twice-JEE Main 2022,JEE Main 2024 )
- (A) Block will not move, frictional force is 30 N
- (B) Block will move, frictional force is 15 N
- (C) Block will not move, frictional force is 20 N
- (D) Block will move, frictional force is 10 N
Solution:1
The maximum static friction is given by:
Since the block will move, the frictional force acting on the block is equal to:
Answer: (B) 9.8 N
Solution:2
The total mass of the system is m=4+6=10 kg.
The force exerted by the 4 kg block on the 6 kg block is
Answer: (A) 3 m/s2 ,18 N
Solution:3
The component of the weight acting parallel to the plane is
The maximum static friction is:
Since,
Answer: (C) 8.66 N
Solution:4
For block m1:
Substituting equation (2) into equation (1)
Answer:The correct answer should be close to 6.25 m/s2, and tension should be approximately 18.75 N.
Solution:5
The normal force N (which is the reading on the weighing machine) provides the apparent weight of the person. When the lift is accelerating upwards, the apparent weight increases and is given by:
Answer: (A) 720 N
Solution:6
The net force is:
The acceleration is:
Answer is (B) 1.5 m/s2.
Solution:7
The coefficient of static friction is:
Answer: (B) 0.3
Solution:8
Answer: (C) 8.66 m/s2
Solution:9
The acceleration is given by:
Answer: (B) 5 m/s2
Solution:10
The maximum static friction is:
The horizontal component of the applied force is:
Answer: (B) Block will move, frictional force is 15 N.
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