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An object of mass 10kg is placed on an inclined plane at 30 degree to the horizontal, calculate the reaction between the two surfaces and the coefficient of static friction

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  1. normal force: mg*cosTheta=10*9.8*1/2*sqrt3

  2. force down the plane: mg*sin30=1/2*10*9.8
    if it is not moving, this has to eqkual frection force.
    friction force=mg*coefficent*cos30
    or coefficent= sin30/cos30=tangent(30 deg)

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