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If the coefficient of kinetic friction i...

If the coefficient of kinetic friction is 0.21, how much work do you do when you slide a `50 – kg` box at constant speed across a `4.8-m` wide room ?

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Two blocks are connected over massless pulley as shown in figure. The mass of block Ais 10 kg and the coefficient of kinetic friction is 0.2 .Block A sliders down the incline at constant speed. The mass of block B in kg is

A horizontal force of magnitude 41.0 N pushes a block of mass 4.00 kg across a floor where the coefficient of kinetic friction is 0.600. (a) How much work is done by that applied force on the block-floor system when the block slides through a displacement of 2.00 m across the floor ? (b) During that displacement, the thermal energy of the block increases by 40.0 J. What is the increase in thermal energy of the floor ? (c) What is the increase in the kinetic energy of the block ?

Knowledge Check

  • Block A weights 4 N and block B weights 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. The force F to slide B at a constant speed, when A rests on B and moves with it, is

    A
    2 N
    B
    3 N
    C
    4 N
    D
    5 N

  • Two blocks are connected over a massless pulley as shown in figure. The mass of block A is 10 kg and the coefficient of kinetic friction is 0.2 Block A sliders down the incline at constant speed. The mass of block B in kg is

    A
    5.4
    B
    3.3
    C
    4.2
    D
    6.8

  • A 55-kg box is being pushed a distance of 7.0 m across the floor by a force vec(p) whose magnitude is 150 N. The force vec(P) is parallel to the displacement of the box. The coefficient of kinetic friction is 0.25. Determine the work done on the box by each of the four forces that act on the box. Be sure to include the proper plus or minus sign for the work done by each force. ( The four forces and the force P, the frictional force f, the normal force N, and the force due to gravity mg. )

    A
    `{:(""W_(p),""W_(f),""W_(N),""W_(mg)),(1.0xx10^(3)J,-940J,-3.8xx10^(3)J,3.8xx10^(3)J):}`
    B
    `{:(""W_(p),""W_(f),""W_(N),""W_(mg)),(1.0xx10^(3),-940J,"zero"J,"zeroJ"):}`
    C
    `{:(""W_(p),""W_(f),""W_(N),""W_(mg)),("zeroJ",940J,-3.8xx10^(3)J,3.8xx10^(3)J):}`
    D
    `{:(""W_(p),""W_(f),""W_(N),""W_(mg)),(-1.0xx10^(3)J,"zeroJ","zeroJ",-3.8xx10^(3)J):}`

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    A factory worker pushes a 25.0 kg crate downward at an angle of 30^(@) below the horizontal a distance of 6.0 m along a level floor. (a) What magnitude of force must the worker apply to move the crate at constant velocity, if the coefficient of kinetic friction between the crate and floor is 0.3 ? (b) How much work is done on the crate by this force when the crate is pushed a distance of 6.0 m? (c) How much work is done on the crate by friction during this displacement ? (d) How much work is done by the normal force and by gracity ? (e) What is the total work done on the crate ? Take g=10m//s^(2)

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