The set of forces, whose resultant is zero, are known as-

The set of forces, whose resultant is zero, are known as- Correct Answer Equilibrium forces

Explanation:

• If the resultant of forces acting on a particle is zero, the particle will be in equilibrium.
• Such a set of forces, whose resultant is zero, are called equilibrium forces.
• The force, which brings the set of forces in equilibrium, is called an equilibrant.

Additional Information

When two or more forces act on a body, they are called to form a system of forces.

• Concurrent forces: The forces, which meet at one point, are known as concurrent forces. The concurrent forces may or may not be collinear.
• When a number of non-parallel forces hold a rigid body in equilibrium, they must be concurrent forces. 
• Coplanar forces: The forces, whose lines of action lie on the same plane, are known as coplanar forces.
• Collinear forces: The forces, whose lines of action lie on the same line, are known as collinear forces.
• Coplanar concurrent forces: The forces, which meet at one point and their lines of action also lie on the same plane, are known as coplanar concurrent forces.
• Coplanar non-concurrent forces: The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplanar non-concurrent forces.
• Non-coplanar concurrent forces: The forces, which meet at one point, but their lines of action do not lie on the same plane, are known as non-coplanar concurrent forces.
• Non-coplanar non-concurrent forces: The forces, which do not meet at one point and their lines of action do not lie on the same plane, are called non-coplanar non-concurrent forces.

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