Applied Mechanics and Graphic Statics
A rigid body is in a stable equilibrium if the application of any force

Neither raises nor lowers the CG of the body
Tends to lower the CG of the body
None of above
Can raise the CG of the body but cannot lower it

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Applied Mechanics and Graphic Statics
A body of weight ‘w’ placed on an inclined plane is acted upon by a force ‘P’ parallel to the plane which causes the body just to move up the plane. If the angle of inclination of the plane is ‘θ’ and angle of friction is ‘φ’, the minimum value of ‘P’, is

w cos (θ + φ)/cos φ
w sinθ cos(θ - φ)/sin φ
w sin (θ - φ)/cos φ
w sin (φ - θ)/cos φ

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