00:01
To look at resultance and couple moments of forces acting at a reference point.
00:06
Now let's say we have two forces, f1 and f2, as you can see from the diagram, i want to know the resultant of this force.
00:15
So the resultant of the force is just to add f1 and f2.
00:19
So it's going to give us, let's call it fr is equal to.
00:35
So when you add it, you're going to have it to be 6i, 6i plus.
00:45
5j all the directions that required 5j minus 5 k kilo mutin so that's that's the result and for the two forces f1 and f2 then if you have to look for the couple moment the moment so it's going to give us uh let's just call that one m so to do that we'll multiply uh the position vector based on arrow 1 on point o with the force f1 and add it to the position vector based on the force 2.
01:38
So the position vector is arrow 2 times the force 2.
01:42
So we'll add them together.
01:43
We'll multiply this two and this other component and add them together.
01:47
Of course, we'll use matrices to solve it so that we'll now have our, let's put this on, we'll have our answer to be something that look like this.
02:01
So it will be equal to, we'll form the matrices.
02:03
Of course, for r1, for r1, the position is 0 .8.
02:10
We look at it from the diagram, 0 .80 and minus 1 .2...