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Physics

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A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.

  • Physics -

    (23kg)(9.8m/s^2)(cos(38)) = 177.6N

  • Physics -

    You do not say if the child is going at constant speed or alternatively what the coef of friction is. You also do not say what the question is.

  • Physics -

    All I can say is
    normal force = 23 * 9.81 * cos 38 = 178 N agreed

    force down slide = 23 * 9.81 * sin 38 = 139 N

    force up slide = 178 * mu
    so

    23 a = 139 - 178 mu

    if a = zero, you can solve for mu
    if you know mu, you can solve for a

  • Physics -

    The normal force is 160 N. I am not quite sure how to find it though. The back of my textbook just says 160 N.

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