# Science

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

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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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