A force which combines with two or more forces to produce equilibrium is called

Explanation:

Equilibrium

• A body will be in equilibrium if there is no resultant force or couple acting on it.
• The equilibrium is static if the body's velocity is also zero, and dynamic if it is not.
• Therefore, for equilibrium, all the horizontal components of the force must cancel one another, and all the vertical components must cancel one another as well.
• This condition is necessary for equilibrium, but not sufficient.
• For example, if a person stands a book up on a table and pushes on the book equally hard with one hand in one direction and with the other hand in the other direction, the book will remain motionless if the person's hands are opposite each other. (the net result is that the book is being squeezed).
• If, however, one hand is near the top of the book and the other hand near the bottom, a torque is produced, and the book will fall on its side.
• For equilibrium to exist, it is also necessary that the sum of the torques about any axis be zero.