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A heavy box of mass 20 kg is pulled on a...

A heavy box of mass 20 kg is pulled on a horizontal force.If the coefficient of kinetic friction between the box and the horizontal surface is 0.25, find the force of friction exerted by horizontal surface on the box.

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The correct Answer is:
direction oppodite to the pull.
direction oppodite to the pull.
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Knowledge Check

  • A block of mass M is using on a rough horizontal surface. mu_R is the coefficient of kinetic friction between the block and the surface. What is the net force exerted by the surface on the block?

    A
    Mg
    B
    `muMg`
    C
    `Mgsqrt(1+mu_(K)^(2))`
    D
    `Mgsqrt(1-mu_(K)^(2))`

  • A mass m rests under the action of a force F as shown in the figure-2.158 on a horizontal surface. The coefficient of friction between the mass and the surface is mu . The force of friction between the mass and the surface is :

    A
    `mumg`
    B
    `mu[mg+(F)/(2)]`
    C
    `(Fsqrt(3))/(2)`
    D
    `mu[mg-(F)/(2)]`

  • A horizontal force F pulls a 20 kg box at a constant speed along a horizontal floor. If the coefficient of friction between the box and the floor is 0.25,how much work is done by the force F in moving the box through a distance of 2 m?

    A
    49J
    B
    98J
    C
    147J
    D
    196J

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