Resultant Moment of Force Around Point O: 20 Nm Clockwise

[Saanchi]

Homework Statement

Calculate resultant moment of forces about pt O and state its direction.

Homework Equations

Put the picture. Check it out

The Attempt at a Solution

What I did was :
About A : 60Nm
B: 40 Nm
C : 120Nm.

I'm not sure to add or subtract for resultant. What I did::
Add. A-B as they are in same direction : 6040 : 100
Then subtract 120 to it as opposite direction direction

Therfore. 20 Nm

Am I right about the resultant or totally wrong?

Direction : Clockwise.

 

[FactChecker]

You are correct. You should specify that it is clockwise around the axis coming out of the page. In complicated situations, you define a right-hand coordinate system. Then your moments around an axis have the appropriate sign and you don't have trouble keeping track of clockwise, counterclockwise around which axis.

 

[Saanchi]

You are correct.

Alright. Thanks :)