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A 90Kg box is pushed by a horizontal force F at constant speed up a ramp incined at 28 degrees. Determine the magnitude of applied force when the ramp is frictionless and when the coefficient of kinetic friction is 0.18

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    x-axis - along the ramp, y-axis - perpendicular to the ramp (upwards).

    x: F =F(fr) + m•g•sinα,
    y: N=mgcos α,
    F=μ•N + m•g•sinα = μ• m•g•cos α + m•g•sinα =m•g(μ• cos α+ sinα)

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