Define moment of force

(i) Define moment of force.

 (ii) Write the relationship between the SI and CGS unit of moment of force.

Answer

(i) The turning effect of force (on a body pivoted) about an axis/ fixed point/ a point or the product of magnitude of force and the perpendicular distance of line of action of force from the axis of rotation/fulcrum or moment = FF × dd where d = perpendicular distance between the point of application of force and axis of rotation / fulcrum.

(ii) 1 N m = 10⁷ dyn cm or 1 dyn cm = 10^-7 N m