CE 214 Chapter Notes - Chapter 4: Unit Vector
16 Mar 2016
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Homework: chapter 2: 131, 140, and chapter 3: 9,11, 21, 35, 46, 53, due. Moment as a vector is always perpendicular to the plane. Moment of any force f about point o is equal to the moment of the components about point o: scalar definition assuming clockwise as positive. 4. 3: moment of a force about a line: moment about a line: n is a unit vector in the direction of the line l, special case. Coupled forces: equal and opposite vectorially meaning that they are parallel and they are separated by a distance d". Couple: moment produced by two equal, opposite and noncollinear forces, produces rotation only. Equivalent couples: values of f and d do not change a given couple as long as f*d remains the same. A couple is not affected if the forces act in a different but parallel plane.
