Free physics question bank
Work , Power and Energy questions with solutions
Practice Work , Power and Energy for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–10 of 332 questions
- NumericmediumWork , Power and Energy
A particle of mass 5 kg is free to slide on a smooth ring of radius r=20 cm fixed in a vertical plane. The particle is attached to one end of a spring whose other end is fixed at the top point O of the ring. Initially the particle is at rest at point A such that ∠OCA=60°, where C is the centre of the ring. The natural length of the spring is also r=20 cm. After release, the particle slides down the ring and the contact force becomes zero when it reaches the lowest point B. Determine the spring constant k in N/m.
JEE Advanced
Open question & full solution → - MCQeasyWork , Power and Energy
A particle of mass m moves on a straight line with its velocity increasing with distance according to the equation v = α√x, where α is a constant. The total work done by all the forces applied on the particle during its displacement from x = 0 to x = d, will be:
Options
JEE Mains 2024 09 Apr Morning Shift
Open question & full solution → - A/RmediumWork , Power and Energy
Evaluate the following statements.
Assertion
Assertion (A): For a car driven by an engine of constant power on a resistance-free horizontal road, acceleration decreases as speed increases.
Reason
Reason (R): At constant power, the driving force is inversely proportional to speed.
Options
JEE MainsNEETJEE Advanced
Open question & full solution → - MCQeasyWork , Power and Energy
The potential energy U(x) of a particle moving along x-axis is shown in figure. Which one of the following graphs represents the variation of kinetic energy of this particle if its total mechanical energy is E₀?
Options
JEE MainsNEET
Open question & full solution → - MCQmediumWork , Power and Energy
Two particles of masses m₁>m₂ move with the same momentum but different kinetic energies E₁ and E₂. Which statement is true?
Options
AIPMT 2004NEET
Open question & full solution → - A/ReasyWork , Power and Energy
Evaluate the following statements.
Assertion
Assertion (A): Mechanical energy of a particle can remain constant even though its kinetic and potential energies continuously change.
Reason
Reason (R): For motion under conservative forces, ΔK = -ΔU.
Options
JEE MainsNEETJEE Advanced
Open question & full solution → - MCQmediumWork , Power and Energy
A uniform chain of length L and mass M overhangs a horizontal table with two-thirds of its length on the table. The friction coefficient between chain and table is µ. Find the work done by friction while the chain slips completely off the table.
Options
JEE Advanced
Open question & full solution → - MCQmediumWork , Power and Energy
A force Fₓ varies with position x as shown in the graph. Find the work done by the force as the particle moves (a) from x=0 to 5.00 m, (b) from x=5.00 m to 10.0 m, (c) from x=10.0 m to 15.0 m, and (d) the total work from x=0 to 15.0 m.
Options
JEE Advanced
Open question & full solution → - NumericeasyWork , Power and Energy
A 1 kg particle attached to a string of length 1 m has speed √(30) m/s at a point where the string is horizontal. Take g=10 m/s². If tension there is N newton, find N.
JEE MainsNEETJEE Advanced
Open question & full solution → - MCQeasyWork , Power and Energy
The components of a force acting on a particle are varying according to the graphs shown. To reach at point B (8, 20, 0) from point A(0, 5, 12) the particle moves on paths parallel to x-axis then y-axis and then z-axis, then work done by this force is :-
Options
JEE MainsNEET
Open question & full solution →