Work Calculation | Adv and Mains Imp PYQ 's

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Together, we will dissect a carefully curated selection of challenging problems that have appeared in recent JEE examinations, allowing you to gain a thorough understanding of the Laws of Physics and how they are applied in real-world scenarios.

Q : A person pushes a box on a rough horizontal platform surface. He applies a force of 200 N over a distance of 15 m. Thereafter, he gets progressively tired and his applied force reduces linearly with distance to 100 N. The total distance through which the box has been moved is 30 m. What is the work done by the person during the total movement of the box?

Q : A small block starts slipping down from a point B on an inclined plane AB, which is making an angle θ with the horizontal section BC is smooth and the remaining section CA is rough with a coefficient of friction μ . It is found that the block comes to rest as it reaches the bottom (point A) of the inclined plane. If BC = 2AC, the coefficient of friction is given by μ = k tanθ. The value of k is

Q : Consider a force vector F = -xi + yj. The work done by this force in moving a particle from point A(1, 0) to B(0, 1) along the line segment is : (all quantities are in SI units)

Q : A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in figure. Work done by normal reaction on block in time t is

Q : The work done on a particle of mass m by a force
K/(x^2+y^2)^3/2)(xi + yj)(K being the constant of appropriate dimensions, when the particle is taken from the point (a, 0) to the point (0, a) along a circular path of radius a about the origin in the x-y plane is:

Q : If W1, W2 and W3 represents the work done in moving a particle from A to B along three different paths 1, 2 and 3, respectively (as shown) in the gravitational field of a point mass m, find the correct relation between W1, W2 and W3.

Q : A force F = -k(yi + xj) [where k is a positive constant] acts on a particle moving in the x– y plane. Starting from the origin; the particle is taken along the positive x-axis to the point (a, 0) and then parallel to the y–axis to the point (a, a). The total work done by the force on the particle is

Q : A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, work required to pull the hanging part on to the table is:

Q : A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g=10m/s^2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.

Q : A particle is moved along a path AB−BC−CD−DE−EF−FA, as shown in figure in presence of a force F = (αy i + 2αx j ) N, where x and y are in meter and α=−1Nm−1. The work done on the particle by this force
F will be _______ joule.

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[SiddharthaNath-xzbd]

I don't know why but you sound so mature😊good video BTW

[Saksham]

Hey your advice was very helpful . Now i can solve any advanced level problem from nlm . Can you also suggest good soyrce of theory feom where i can read Work Power and Energy