1. the alg. sum of the moments of a system of forces acting at a point about any point in space is equal to the moment of the resultant of these forces about the same point. (theorem)2. if the sum of the moments of a system of forces about the point A = the sum of the moments of these forces about the point B then the line of action of the resultant is parallel to 3. if the sum of the moments of a system of coplanar forces about the point A = - the sum of these moments of these forces about the point B then the line of action of the resultant passes through the midpoint of .4. if the sum of the moments of a system of coplanar forces about the point A = 0 then the line of action of the resultant passes through the point A.

1. the alg. sum of the moments of a system of forces acting at a point about any point in space is equal to the moment of the resultant of these forces about the same point. (theorem)2. if the sum of the moments of a system of forces about the point A = the sum of the moments of these forces about the point B then the line of action of the resultant is parallel to 3. if the sum of the moments of a system of coplanar forces about the point A = - the sum of these moments of these forces about the point B then the line of action of the resultant passes through the midpoint of .4. if the sum of the moments of a system of coplanar forces about the point A = 0 then the line of action of the resultant passes through the point A.