00:02
Hello, unfortunately, we are not given any diagrams or preamble.
00:09
So i will try to illustrate a general method.
00:17
If we have two forces acting like this, and let's say a third one at a point, and this is f1, this is f2, this is f3, and we are giving the angles that this forces make with horizontal, maybe alpha and beta to find result and force we will need to resolve these forces into their vertical and horizontal components horizontal here becomes f1 cross alpha vertical here is f1 sign alpha similarly so let's use a different color for the horizontal f1 cross alpha similarly the horizontal here is going to be f2 cross beta and the vertical here will be f2 sign beta.
01:31
Now we are adopting a convention where left is negative, right is positive, up is negative, up is positive, down is negative.
01:43
Because force is a vector, so we need to show directions.
01:46
So this force here will be negative.
01:53
Negative of f1, sine alpha.
02:01
So we now find the total vertical forces...