Moment of a Force about a Point

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This Demonstration shows how to find the torque, or moment of force, exerted by a rope on a boom about the point . The torque is a vector quantity, usually written . You can vary the force and the distance . When distance is expressed in meters (m) and force in newtons (N), the torque or moment has the dimension newton-meters (Nm).


To find the moment about , multiply the magnitude with the unit vector from to . Next, use the position vector from to the tension . Finally, the torque about is given by the cross product


Contributed by: Bemnet Gizachew (August 2012)
Addis Ababa Institute of Technology
Open content licensed under CC BY-NC-SA




[1] F. P. Beer Jr., E. R. Johnston, E. R. Eisenberg, W. E. Clausen, and G. H. Staab, Vector Mechanics for Engineers: Statics and Dynamics, 7th ed., Boston: McGraw Hill, 2003.

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