A formula for the composition of forces If F1 and F2 are on the same straight line and in opposite directions, then f = | F1-F2 |, if the directions are the same, then f = F1 + F2. If the directions of the two forces are not the same, but the action points are the same, then f = | F1-F2 |?

A formula for the composition of forces If F1 and F2 are on the same straight line and in opposite directions, then f = | F1-F2 |, if the directions are the same, then f = F1 + F2. If the directions of the two forces are not the same, but the action points are the same, then f = | F1-F2 |?

First of all, you draw two forces F1 and F2 on the draft paper, translate F1 so that the starting point of F1 coincides with the ending point of F2, that is, they are connected end to end. Then, you can calculate f by using the cosine theorem [f ^ 2 = F1 ^ 2 + F2 ^ 2-2f1 * f2cosx (x is the angle between the line where F1 is and the line where F2 is)]