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Work done against friction

This type of question, asked 3 times: 29 Jan 2024, 30 Jan 2024, 5 Apr 2026 S2. All 3 questions below, oldest first.

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  1. Question 1

    29 Jan 2024

    9
    A block of mass 100 kg100\text{ }kg slides over a distance of 10 m10\text{ }m on a horizontal surface. If the co-efficient of friction between the surfaces is 0.4, then the work done against friction (in JJ ) is :

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  2. Question 2

    30 Jan 2024

    92
    A block of mass 1 kg1\text{ }kg is pushed up a surface inclined to horizontal at an angle of 60∘60^{\circ} by a force of 10 N10\text{ }N parallel to the inclined surface as shown in figure. When the block is pushed up by 10 m10\text{ }m along inclined surface, the work done against frictional force is: [g=10 m/s2]\left\lbrack g = 10\text{ }m/s^{2} \right\rbrack

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  3. Question 3

    5 Apr 2026 S2

    3
    A mass of 1 kg kept on an inclined plane with 30∘30^{\circ} inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s4\text{ }m/s. The work done by the frictional force in time 2 s is ____\_\_\_\_ J. (Take g=10 m/s2g = 10\text{ }m/s^{2} )

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