What is the relationship between couples and moments in physics?

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A couple in physics refers to two equal and opposite forces that create a rotational effect without translating the object. If forces are unequal, such as 2N and 3N, they do not form a couple, as a couple requires both forces to be equal and parallel. The discussion highlights the importance of force diagrams in understanding these concepts, particularly in analyzing equilibrium conditions. Moments are indeed related to couples, as they describe the tendency of forces to cause rotation. The relationship between couples and moments is crucial for understanding rotational dynamics in physics.
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Can anybody tell me what a couple is. From what i gather it is when two forces are equal, opposite and parallel.

But but if 1 force is bigger than the other say a 2 and a 3N force could it be said that there is a couple of 2N forces ?

Does it have anything to do with moments?
__________

Daniel
 
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Draw yourself a force diagram showing what you have just described, with unequal forces.

Now resolve horizontally and vertically.

Does your diagram describe equilibrium?

Does that answer your question?
 


so i suppose it depends on the angle? but don't they have to be strictly parallel?
 

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