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equilibrant
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A diagram shows a bar with point A on the left, two forces F1 and F2 acting vertically on the bar, and a resultant force FR equal to F1 plus F2 acting at the right end. An equilibrant force Fe, equal in magnitude and opposite to FR, is also shown at the right end.
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equilibrant

mechanics
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A diagram shows a bar with point A on the left, two forces F1 and F2 acting vertically on the bar, and a resultant force FR equal to F1 plus F2 acting at the right end. An equilibrant force Fe, equal in magnitude and opposite to FR, is also shown at the right end.
resultant and equilibrant forces Figure 18: The resultant force (FR) produces the same net force and the same net torque about point A as F1 + F2; the body can be brought into equilibrium by applying the equilibrant force Fe.

In mechanics, an equilibrant is a force that balances one or more unbalanced forces, bringing a system into a state of equilibrium. Equilibrium occurs when a system's state of motion and internal energy do not change over time. For a single particle, equilibrium is achieved when the vector sum of all forces acting on it is zero. A rigid body is in equilibrium if the sum of forces and the sum of torques acting on it are both zero, meaning its linear and rotational motion remain constant.12

Newton's laws of motion are fundamental to understanding equilibrium. The first law states that an object will remain at rest or in uniform motion unless acted upon by an external force. The second law relates force, mass, and acceleration ((F=ma)). The third law states that for every action, there is an equal and opposite reaction. When forces acting on an object are balanced, it is in equilibrium and does not accelerate.3

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5 Britannica Sources
  1. equilibrant
  2. equilibrium
  3. electricity - Calculating the value of an electric field
  4. mechanics - Newton’s laws of motion and equilibrium
  5. equilibration

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