To be able to calculate the moment of a force about a specified axis. When the m

Question

To be able to calculate the moment of a force about a specified axis.

When the moment of a force is computed about a point, the moment and its axis are always perpendicular to the plane that contains the force and the moment arm. In some instances it is important to find the component of this moment along a specified axis that passes through the point.

In addition to scalar analysis, Ma, the magnitude of the moment of a force about a specified axis, can be found using the triple scalar product

Ma=ua?(r

Explanation / Answer

Position Vector And Force Vector:

rBC = {(0.55 - 0)i + (0.4 - 0.4)j + (-0.2 - 0)k}m = {0.55i - 0.2k} m

F = 80 (cos 30

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