CE 2450 Chapter : Lesson 11
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4. 5 moment of a force about a specified axis. The force f creates the moment mo about o; however, the nut can only rotate about the y-axis. Therefore, the turning effect depends only on the y- component of the moment. To determine a moment about an axis passing through o we must first find the moment about o in cartesian form. r . The moment about an axis a will be the projection of mo on the axis. Ma can be found by dotting mo with a unit vector along a. Calculating ma this way is referred to as the scalar triple product. If ma is positive ma has the same direction as ua. If ma is negative ma has the opposite direction as ua. Determine the moment produced by force f about the diagonal od of the rectangular block.