Wrench shown below with two forces acting upon it
the combined moment for both forces about point C
In order to simplify the solution, begin by considering only one force at a time with C as the center of moments. In order to do this, consider that a moment is defined as the product of a force and a specific perpendicular distance. Find the moment for each force separately. The 100 pound force has a moment arm (perpendicular distance from line of action to the center of moments) of 12 inches. Therefore, the moment caused by this force equals
The moment arm for the 200 pound force is zero because the line of action of the force passes through C. So the moment caused by the 200 pound force is
In order to find the combined moment of the two forces, simply add their individual moments or
What is the total combined moment about point B?