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  4. A small block of mass 2 kg is kept on a rough inclined surface of inclination θ=30° fixed in a lift. The lift goes up with a uniform speed of 1 m s -1 and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of 2 s is

Q. A small block of mass is kept on a rough inclined surface of inclination fixed in a lift. The lift goes up with a uniform speed of and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of is

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Solution:

Since the lift's speed is constant, in the absence of acceleration, there will be no pseudo-force (referring to the lift as the frame of reference) or additional reaction/thrust due to inclined plane (referring to ground as the reference frame) on the particle.
Therefore, friction acting along the plane.
Distance moved by the particle (or lift) in time
Work done in time

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