Work Energy and Power JEE Mains Questions, Download PDF, Practice Sample Questions
Swati Kumar27 Nov, 2025
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Work Energy and Power JEE Mains Questions: Work, energy, and power are among the most important units of JEE Main Physics. At least 2–3 questions are asked every year from this unit in JEE Main. A strong grip on formulas, concepts, graphs, and problem-solving is essential for scoring full marks.
Practising Work Energy and Power JEE Mains Questions enhances conceptual clarity, strengthens problem-solving speed, and builds accuracy for both JEE Main and JEE Advanced. Regular practice enables students to relate this chapter to other related topics, such as Laws of Motion and Rotational Dynamics, which enhances overall physics preparation.
Work Power And Energy IIT JEE Questions PDF Download
IIT JEE questions PDF on Work, Power, and Energy provide a list of problems from previous years' exams with answers. These PDFs cover all important topics and provide practice material to students directly according to the standards of IIT JEE. Practising Work Power And Energy IIT JEE Questions during your preparation improves confidence and enhances your analytical skills essential for skill for IIT JEE physics. Here are some questions from the Work Energy and Power JEE Mains Questions PDF:
Q1 An automobile of mass m accelerates starting from origin and initially at rest, while the engine supplies constant power. The position is given as a function of time by :
[JEE Main 2021, 27 Jul (Shift 2)]
Q2 If the kinetic energy of a moving body becomes four times its initial Kinetic energy, then the
percentage change in its momentum will be
[JEE Main 2021, 20 Jul (Shift 2)]
Q3 A body at rest is moved along a horizontal straight line by a machine delivering a constant
power. The distance moved by the body in time 't' is proportional to:
[JEE Main 2021, 20 Jul (Shift 2)]
Q4 A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a constant velocity. Calculate the work done by the porter in lowering the suitcase. Take g = 9.8 m/s2.
(JEE Main 2021, 22 Jul Shift 2)
Q5 A body of mass m dropped from a height h reaches the ground with a speed of sqrt(0.8gh). The value of work done by air friction is.
(JEE Main 2021, 1 Sep Shift 2)
For more questions download the Work Power And Energy IIT JEE Questions PDF from the link given below:
Work Power And Energy IIT JEE Questions PDF Download
Important Concepts for JEE Questions on Work Energy and Power
Important Concepts for Work, Energy and Power JEE Main focuses on understanding how work, energy, and power relate to motion and forces. These concepts help in solving JEE Main physics work energy and power questions efficiently. Some of them are mentioned below:
| Important Concepts for Work, Energy and Power JEE Main | |
| Concept | Explanation |
| Work Done by Constant Force | W = F × s × cosθ |
| Work Done by Variable Force | W = ∫F dx (area under F-x graph) |
| Kinetic Energy (KE) | KE = 1/2 mv² |
| Potential Energy (PE) | PE = mgh, Spring PE = 1/2 kx² |
| Work-Energy Theorem | Net work = change in kinetic energy |
| Conservation of Mechanical Energy | KE + PE = constant (no non-conservative forces) |
| Power (Instantaneous and Average) | P = dW/dt, P = F·v |
| Collision and Energy Loss | KE before ≠ KE after (inelastic) |
| Frictional Work | W_friction = –μmg cosθ × distance |
| Potential Energy Curves | Determines stability of equilibrium |
| Momentum–Energy Relationship | p = √(2mKE) |
| Centre of Mass + Work | Work affects KE of COM |
Sample Work Power and Energy JEE Questions
The following are some commonly asked questions of JEE Main Physics work energy and power questions, explained in a step-by-step manner.
Question 1: A force acts on a particle along the x-axis such that F = 6x. Find the work done in moving the particle from x = 0 to x = 4 m.
Solution:
W = ∫ 6x dx from 0 to 4
W = 6 * (x^2 / 2)
W = 3 * (4^2)
W = 3 * 16 = 48 J
Question 2: A block of mass 2 kg starts from rest and slides down a frictionless incline that has an elevation of 5 m. Find the speed at the bottom.
Solution:
Initial PE = mgh = 2 * 9.8 * 5 = 98 J
Using work–energy theorem:
PE lost = KE gained = 98
1/2 mv^2 = 98
v^2 = 98
v ≈ 9.9 m/s
Question 3: A constant force of 20 N pulls a body at a velocity of 3 m/s. Find the power delivered.
Solution:
P = F × v = 20 × 3 = 60 W
Question 4: How much potential energy is stored in a spring with constant k = 200 N/m that has been compressed by 0.1 m?
Solution:
PE = 1/2 kx^2
PE = 1/2 * 200 * 0.1^2 = 1 J
Question 5: A body is shifted 5 m on a rough surface whose frictional force is 10 N. Find the work done.
Solution:
W = F × s
W = 10 × 5 = 50 J [negative work]
How to Prepare from Work Power and Energy IIT JEE Questions PDF?
Start by understanding the key concepts and formulas behind these. Practice various types of solved and unsolved problems from JEE-level PDFs to develop problem-solving techniques.
Here are a few preparation tips:
- Revise the basic concepts and formulas with respect to work, energy, and power before trying the questions.
- Solve the numerical, conceptual, and application-based questions from the Work Energy and Power JEE Mains Questions PDF to reinforce your understanding.
- Identify frequently asked question types and patterns common in IIT JEE exams to prioritise important topics.
- Practice solving Work Energy and Power JEE Mains questions under timed conditions to improve speed and accuracy.
- Analyse the detailed solutions provided. Learn from the mistakes, and clarify doubts without repeating them.
- Regularly revise important formulae and problem-solving techniques to retain knowledge and boost confidence.