The resultant force of F1 and F2 is F. if the angle between the two forces remains unchanged, when will the resultant force remain unchanged when F1 becomes larger

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If the angle between the forces F1 and F2 is 180 degrees, F1 = F2. What is the magnitude and direction of the resultant force F?

180 degrees means that two forces are in the same line and the direction is opposite! Because the two forces are equal, the resultant force is zero, and the resultant force direction is arbitrary (because the resultant force is zero)!

There are two equal forces F1 and F2. When their angle is 90 degrees, the resultant force is F. when their angle is 120 degrees, what is the resultant force?

F1 = F2, when F1 is perpendicular to F2, f = root 2 * F1, draw the stress analysis diagram
When the included angle is 120 degrees, f '= F1, so f' = 1 / 2 root sign 2 * F

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