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An Olympic bobsledder pushes a 200 kg bobsled at 8 m/s. If the man pushes with a force of 1200 N, how much force of friction is present?

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    Wb = mg = 200kg * 9.8N/kg = 1960N.

    Fb = 1960N @ 0deg. = Force of bobsled.
    Fp = 1960sin(0) = 0 = Force parallel to surface.
    Fv = 1960cos(0) = 1960N. = Force perpendicular to surface.

    Fn = Fap - Fp - Ff = ma = 0, a = 0.
    1200 - 0 - Ff = 0,
    Ff = 1200 - 0 = 1200N. = Force of friction.

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