MOMENT

n. Mo'm'nt. Lat., momentum (from movere, to move). Fr., m. The measure of the tendency of a force to produce motion, [a. 49.] Bending m. The m. of a bending force. [a, 49.] Component m. The m. of a component of a force, [a, 49.] Magnetic m. The measure of the strength of a magnet. It is expre ed in dynes, [a, 49.] M. of a couple. The product of one of the forces of the couple into their distance apart, [a, 49.] M. of a force (with respect to any axis). The product of the projection of the force (expre ed according to graphical geometry) on the plane of rotation into the distance of the line of action of the force from the axis, [a, 49.] M. of flexure. See Bending m. M. of inertia. The algebraic sum of the m's of all the elements of a body with respect to the same axis, when the body is revolving with an angular velocity of unity. It is equal to the ma multiplied by the square of the principal radius of gyration, [a, 49.] M. of instability. The m. of the weight of a body taken with respect to that side of the polygon of support that is nearest to the line of direction of the weight when this line pa es without the polygon of support. It is equal to the m. of the least force that can prevent the body from overturning, [a, 49.] M. of ma . See M. of inertia. M. of resilience. The m. of the resistance of a body to flexure, [a, 49.] M. of rotation. See M. of inertia.- M. of stability. The m. of the weight of a body taken with respect to that side of the polygon of support that is nearest to the line of direction of the weight when this line pa es within the polygon of support. It is equal to the m. of the least extraneous force that is capable of overturning the body, [a, 49.] M. of torsion. The m. of the pair of equal and opposite couples which, being applied at different points of a body, tend to twist the intermediate portion, [a, 49.] Resultant m. The m. of the resultant of a set of forces, fa, 49.] Statical m. The product of a force into its lever arm. [a, 49.] Twisting m. SeeJV/. of torsion. Yirtual m. The product of a force into its virtual velocity, [a, 49.] [s. 18]