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Describe the moment of a force about a point as a vector quantity. |
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Answer» Solution :In Fig. O is the POINT of rotation, P is the point of application of a force `vecF`, `vecr`=`vecOP`, POSITION vector of the point `vecP`, with respect to the point O. Then the moment of the force `vecF` about the point O, is `vecF=vecrxxvecF` According to the PROPERTIES of cross PRODUCT the direction of the vector `vecG` is along the direction of advance of a righthanded screw, when it is rotated from `vecr` towards `vecF`. The direction of `vecG`, as shown in the figure, is perpendicular to the plane of rotation, i.e., ALWAYS along the axis of rotation. 
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