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. Work, Energy and Power 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.

  • Work, Energy and Power 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.
  • Work, Energy and Power in JEE Mains Physics Syllabus 2025 covers all the basic concepts on units and measurements, fundamentals of units, dimensions etc.

Aspirants consider Work, Energy and Power 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:

Some of the most asked questions in the JEE Main Work, Power, and Energy section include:

  • Work-energy theorem: This theorem states that if a body does some work, its kinetic energy increases by the same amount.
  • Potential energy of a spring: The potential energy of a spring is the energy associated with its compression or expansion.
  • Conservation of mechanical energy: This is a topic covered in the Work, Power, and Energy section.
  • Non-conservative forces and friction: This is a topic covered in the Work, Power, and Energy section.
  • Power and efficiency in machines: This is a topic covered in the Work, Power, and Energy section.
  • Energy conservation in simple harmonic motion: This is a topic covered in the Work, Power, and Energy section.
  • Conservation of energy in collisions: This is a topic covered in the Work, Power, and Energy section.

Work, Energy and Power JEE Mains Questions -

List Of Most Asked Questions With Solutions

In the (JEE) Main, the topic of Physics and Measurement 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 pushed against a wall with a force of 20 N. The coefficient of static friction between the block and the wall is 0.5. Find the work done by the frictional force if the block does not move and is pushed upwards by 0.2 m. (This question has been asked twice-JEE Main 2022,JEE Main 2022 )

  • (A) 1 J
  • (B) 2 J
  • (C) 0 J
  • (D) 4 J

Question 2: A block of mass 5 kg is dropped from a height of 10 m. Find the kinetic energy of the block just before it touches the ground. (Take g=10 m/s2) (This question has been asked thrice-17 Mar 2021 Shift 2,JEE Main 2019,JEE Main 2022 )

  • (A) 250 J
  • (B) 350 J
  • (C) 500 J
  • (D) 1000 J

Question 3: A car of mass 1000 kg is moving at a speed of 10 m/s. How much work is required to stop the car? (This question has been asked twice-JEE Main 2020,JEE Main 2022 )

  • (A) 50000 J
  • (B) 100000 J
  • (C) 20000 J
  • (D) 25000 J

Question 4: A spring of force constant k=100 N/m is compressed by 0.1 m from its natural length. Calculate the potential energy stored in the spring. (This question has been asked twice-JEE Main 2018,JEE Main 2022 )

  • (A) 0.5 J
  • (B) 0.1 J
  • (C) 1 J
  • (D) 2 J

Question 5: A block of mass 4 kg slides on a rough horizontal surface. The block has a speed of 10 m/s at point A and comes to rest at point B, which is 25 m away from A. What is the work done by the frictional force on the block? (This question has been asked twice-JEE Main 2016,JEE Main 2022 )

  • (A) -200 J
  • (B) -100 J
  • (C) -400 J
  • (D) -250 J

Question 6: A particle of mass 0.5 kg is moving in a straight line under the action of a force which varies with position as shown in the figure. If the velocity of the particle at x=0 is 2 m/s, what is its velocity at x=3m? (This question has been asked twice-JEE Main 2016,JEE Main 2022 )

  • (A) 2 m/s
  • (B) 4 m/s
  • (C) 6 m/s
  • (D) 8 m/s

Question 7: A block of mass 2 kg is moving with a velocity of 5 m/s on a horizontal smooth surface. A constant force of 10 N is applied in the direction of motion for 2 seconds. Find the final kinetic energy of the block. (This question has been asked twice-JEE Main 2016,JEE Main 2018 )

  • (A) 100 J
  • (B) 150 J
  • (C) 200 J
  • (D) 250 J

Question 8: A force of 50 N acts on a body and displaces it by 4 m. The angle between the force and the displacement is 60°. What is the work done by the force? (This question has been asked twice-JEE Main 2015,JEE Main 2018 )

  • (A) 50 J
  • (B) 100 J
  • (C) 150 J
  • (D) 200 J

Question 9: A 1000 kg car is traveling at a speed of 20 m/s. The driver applies brakes and the car comes to rest over a distance of 50 m. What is the average retarding force acting on the car? (This question has been asked thrice- JEE Main 2016,JEE Main 2021,JEE Main 2019 )

  • (A) 400 N
  • (B) 800 N
  • (C) 2000 N
  • (D) 4000 N

Question 10: A particle is projected vertically upward with a speed of 20 m/s. Find the maximum height attained by the particle. (Take g=10 m/s2) (This question has been asked thrice- JEE Main 2016,JEE Main 2021,JEE Main 2019 )

  • (A) 10 m
  • (B) 15 m
  • (C) 20 m
  • (D) 25 m

Solution:1

The frictional force is given by:

Work done by the frictional force is:

Answer: (B) 2 J

Solution:2

The potential energy is:

Just before it touches the ground, the kinetic energy will be equal to the initial potential energy:

Answer: (C) 500 J

Solution:3

The kinetic energy of the car is given by:

Answer: (A) 50000 J

Solution:4

The potential energy stored in a compressed spring is given by:

Answer: (A) 0.5 J

Solution:5

The initial kinetic energy at point A is:

The work done by friction is the change in kinetic energy:

Answer: (A) -200 J

Solution:6

For simplicity, let's assume constant force over distance (hypothetical scenario).

Change in kinetic energy is:

Answer: (A)

Solution:7

The final kinetic energy is:

Answer: closest would be 225 J

Solution:8

The work done by a force is given by:

Answer: (B) 100 J

Solution:9

The work done by the retarding force is W=F⋅d, so

Answer: (D) 4000 N

Solution:10

At maximum height, potential energy is PE=mgh. Equating KE=PE:

Answer: (C) 20 m