5. (Math.) An infinitesimal change in
a varying quantity; an increment or decrement. [Obs.]
6. (Mech.) Tendency, or measure of
tendency, to produce motion, esp. motion about a fixed point or
axis.
Moment of a couple (Mech.),
the
product of either of its forces into the perpendicular distance
between them. --
Moment of a force.
(Mech.) (a) With respect to a point,
the
product of the intensity of the force into the perpendicular distance
from the point to the line of direction of the force.
(b) With respect to a line,
the product of that
component of the force which is perpendicular to the plane passing
through the line and the point of application of the force, into the
shortest distance between the line and this point.
(c) With respect to a plane that is parallel to the
force,
the product of the force into the perpendicular distance
of its point of application from the plane. --
Moment of
inertia,
of a rotating body, the sum of the mass of
each particle of matter of the body into the square of its distance
from the axis of rotation; -- called also moment of rotation
and moment of the mass.
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