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Unformatted text preview: ENGR210, Fall 2011 1 4.3 Moment of a force – vector formulation The moment of a force F about point O, or about the moment axis passing through O and perpendicular to the plane containing O and F is Mo = r x F where r is a position vector from O to any point on the line of action of F . The magnitude of Mo is Mo = r F sin θ = F (r sin θ ) = F d where d is the moment arm The direction of Mo follows the righthand rule. ENGR210, Fall 2011 2 ”Principle of transmissibility” As stated earlier, the position vector r can be from O to any point on the line of action of F . This means that the force vector F can be considered as a sliding vector. This property is called the principle of transmissibility of a force. ENGR210, Fall 2011 3 “Cartesian vector formulation” Or ENGR210, Fall 2011 4 “Resultant moment of a system of forces” If multiple forces are acting on a body, the resultant moment (of the forces) is determined by vector addition of the moment of each force, i.e., (The resultant force is F R = Σ F . Note that forces do not depend on a point, and therefore, F R , not F Ro....
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This note was uploaded on 10/16/2011 for the course ENGR 210 taught by Professor Ko during the Fall '08 term at Boise State.
 Fall '08
 KO
 Statics

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