Work, Energy & Power — JEE Main PYQs & Practice Questions

Work, Energy & Power is a Physics chapter in the JEE Main syllabus. This page brings together 109 previous-year and practice questions on Work, Energy & Power, organised into 6 topics: Work by Constant and Variable Force, Work-Energy Theorem, Conservative and Non-Conservative Forces, Potential Energy, Conservation of Mechanical Energy and Power. Most questions come with a step-by-step solution you can work through free in PrepWiser.

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Work by Constant and Variable Force

• A cricket ball of mass 0.15 kg is thrown vertically up by a bowling machine so that it…
• Consider a force F⃗ = - xî + yĵ . The work done by this force in moving a particle from…
• A force f=x² y î+y² ĵ acts on a particle in a plane x+y=10. The work done by this force…
• A force (3 x²+2 x-5) N displaces a body from x=2 m to x=4 m. Work done by this force is…
• Identify the correct statements from the following : A. Work done by a man in lifting a…
• A 1 kg block subjected to two simultaneous forces (2î+3ĵ+4k̂)N and (3î-ĵ-2k̂)N is moved…
• An object of mass 'm' initially at rest on a smooth horizontal plane starts moving under…
• Two cylindrical vessels of equal cross-sectional area 16 cm² contain water upto heights…
• A block of mass 25 kg is pulled along a horizontal surface by a force at an angle 45°…
• A force F⃗ = (3î + 4ĵ) N acts on a body producing displacement s⃗ = (2î + 3ĵ) m. The…
• A person pushes a box on a rough horizontal plateform surface. He applies a force of 200…
• A force F=(5+3 y²) acts on a particle in the y-direction, where F is in newton and y is…
• A small particle moves to position 5 î-2 ĵ+k̂ from its initial position 2 î+3 ĵ-4 k̂…
• A force F⃗=(2+3 x) î acts on a particle in the x direction where F is in newton and x is…
• A block of mass 10 kg is moving along x-axis under the action of force F=5 x N. The work…
• A force of F = (5y + 20)ĵ N acts on a particle. The work done by this force when the…
• Arrange the four graphs in descending order of total work done; where W₁, W₂, W₃ and W₄…
• A block of mass 2 kg moving on a horizontal surface with speed of 4 ms⁻¹ enters a rough…
• A body of mass 50 kg is lifted to a height of 20 m from the ground in the two different…
• The work done by a constant force F producing displacement s at an angle θ between them…

Work-Energy Theorem

• A ball of mass 4 kg, moving with a velocity of 10 ms⁻¹, collides with a spring of length…
• A spherical ball of mass 2 kg falls from a height of 10 m and is brought to rest after…
• Given below are two statements: Statement I : A truck and a car moving with same kinetic…
• A lift of mass M=500 kg is descending with speed of 2 ms⁻¹. Its supporting cable begins…
• A bullet is fired into a fixed target looses one third of its velocity after travelling…
• If the Kinetic energy of a moving body becomes four times its initial Kinetic energy…
• The velocity of the bullet becomes one third after it penetrates 4 cm in a wooden block…
• A mass of 1 kg is kept on a inclined plane with 30° inclination with respect to…
• A particle of mass m moves on a straight line with its velocity increasing with distance…
• A bullet of mass 0.1 kg is fired on a wooden block to pierce through it, but it stops…
• A 0.5 kg block moving at a speed of 12 ms⁻¹ compresses a spring through a distance 30 cm…
• Four particles A, B, C, D of mass m/2, m, 2 m, 4 m, have same momentum, respectively…
• A uniform chain of length 3 meter and mass 3 kg overhangs a smooth table with 2 meter…
• A car accelerates from rest to u m / s. The energy spent in this process is E J. The…
• A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of 20 ms⁻¹. The…
• Two bodies A and B of masses 5 kg and 8 kg are moving such that the momentum of body B…
• A bead P sliding on a frictionless semi-circular string (ACB) and it is at point S at…
• Two blocks with masses 100 g and 200 g are attached to the ends of springs A and B as…
• A particle of mass 500 gm is moving in a straight line with velocity v = b x 5/2 . The…
• A body of mass 0.5 kg travels on straight line path with velocity v=(3 x²+4) m / s. The…

Conservative and Non-Conservative Forces

• In the presence of friction, mechanical energy alone is not conserved, although total…
• Given below are two statements: one is labelled as Assertion A and the other is labelled…
• Which one of the following forces cannot be expressed in terms of potential energy?
• Given below are two statements : Statement I : An object moves from position r₁ to…

Potential Energy

• The potential energy (U) of a diatomic molecule is a function dependent on r…
• The potential energy function (in J ) of a particle in a region of space is given as…
• Given below is the plot of a potential energy function U(x) for a system, in which a…
• Potential energy as a function of r is given by U = A/r¹⁰ - B/r⁵, where r is the…
• A 2 kg body is held at a height of 10 m above the ground. Its gravitational potential…
• Potential energy ( V ) versus distance ( x ) is given by the graph. Rank various regions…

Conservation of Mechanical Energy

• In the given figure, the block of mass m is dropped from the point 'A'. The expression…
• A particle (m = 1 kg) slides down a frictionless track (AOC) starting from rest at a…
• A body of mass 2 kg is dropped from a height of 20 m. What is its kinetic energy just…
• A body of m kg slides from rest along the curve of vertical circle from point A to B in…
• A ball of mass 100 g is dropped from a height h = 10 cm on a platform fixed at the top…
• A particle is placed at the point A of a frictionless track A B C as shown in figure. It…
• A bead of mass ' m ' slides without friction on the wall of a vertical circular hoop of…
• A particle is released from height S above the surface of the earth. At certain height…
• A block is simply released from the top of an inclined plane as shown in the figure…
• If a rubber ball falls from a height h and rebounds upto the height of h / 2. The…
• As shown in the figure, a particle of mass 10 kg is placed at a point A. When the…
• The bob of a pendulum was released from a horizontal position. The length of the…

Power

• A man does 1000 J of work in 10 s. His average power is:
• A particle is moving unidirectionally on a horizontal plane under the action of a…
• If the maximum load carried by an elevator is 1400 kg ( 600 kg - Passengers + 800 kg -…
• A body at rest is moved along a horizontal straight line by a machine delivering a…
• A constant power delivering machine has towed a box, which was initially at rest, along…
• A body of mass 1kg begins to move under the action of a time dependent force F⃗ = ( tî +…
• A body of mass 2 kg begins to move under the action of a time dependent force given by…
• An automobile of mass 'm' accelerates starting from origin and initially at rest, while…
• A block of mass 5 kg starting from rest pulled up on a smooth incline plane making an…
• A body of mass 2 kg is driven by an engine delivering a constant power of 1 J/s. The…
• Instantaneous power in terms of force F⃗ and velocity v⃗ is:
• A body of mass 2 kg is initially at rest. It starts moving unidirectionally under the…
• Water falls from a 40 m high dam at the rate of 9 × 10⁴ kg per hour. Fifty percentage of…
• An object of mass 1000 g experiences a time dependent force F⃗=(2 t î+3 t² ĵ) N. The…
• A body of mass 4 kg is placed on a plane at a point P having coordinate (3,4) m. Under…
• A body is moving unidirectionally under the influence of a constant power source. Its…
• A sand dropper drops sand of mass m(t) on a conveyer belt at a rate proportional to the…
• The ratio of powers of two motors is (3 √x)/(√x+1), that are capable of raising 300 kg…
• Sand is being dropped from a stationary dropper at a rate of 0.5 kgs⁻¹ on a conveyor…
• A particle of mass m is moving in a circular path of constant radius r such that its…

More Physics chapters

• Basic Mathematics for Physics
• Units, Dimensions & Errors
• Rectilinear Motion
• Vectors
• Projectile Motion & Relative Motion
• Newton's Laws of Motion
• Friction
• Circular Motion
• Centre of Mass & Linear Momentum
• Collision
• Rotational Motion
• Gravitation
• Simple Harmonic Motion
• Elasticity
• Fluid Mechanics
• Surface Tension
• Thermometry & Calorimetry
• Kinetic Theory of Gases
• Thermodynamics
• Heat Transfer
• Mechanical Waves
• Sound Waves
• Experimental Skills
• Electrostatics I — Charges, Field & Gauss's Law
• Electrostatics II — Potential & Capacitance
• Current Electricity
• Moving Charges & Magnetism
• Magnetism & Matter
• Electromagnetic Induction
• Alternating Current
• Electromagnetic Waves
• Ray Optics
• Wave Optics
• Dual Nature of Radiation & Matter
• Atomic Physics
• Nuclear Physics
• Semiconductors & Electronic Devices
• Communication Systems

Frequently asked questions

How many Work, Energy & Power questions are there for JEE Main?

PrepWiser has 109 Work, Energy & Power questions for JEE Main, grouped into 6 topics such as Work by Constant and Variable Force, Work-Energy Theorem and Conservative and Non-Conservative Forces.

Are these Work, Energy & Power questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Work, Energy & Power questions?

Open any Work, Energy & Power question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.