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When two forces are acting upon each other in equal proportions.

That answer is misleading. Forces do not act on each other, and I don't know what the author means by "proportions" in this regard.

An equilibrium of forces means that the net force on a given mass is zero. This happens when all of the external forces acting on an object are zero. From the formula F=ma, you can see that the net force being equal to zero implies that the acceleration is zero, and that the object's velocity is constant.

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13y ago
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13y ago

Two or more forces are balanced if their vector sum is zero. That means they all

cancel each other out, and the total result is just as if there were no forces at all.

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16y ago

1. The summation of forces exerted is equal to zero. 2. The summation of torques is equal to zero.

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Q: What are the principles of equilibrium of forces?
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