The conversation between human and AI assistant.
If the sum of the moments of coplanar forces about three non coplaner points are the same show that the system reduced to a couple?
Got it. Can you explain what a couple is?
Sure. A couple is a pair of forces that are equal in magnitude and opposite in direction, but do not act along the same line. They produce a moment or turning effect on a body which is proportional to the magnitude of either force and the perpendicular distance between them. Couples are found in many mechanical systems, such as in machines and structures where they can be used to create shear stress or bending moments.