When the forces acting upon an object are equal, the object is said to be in?

An object is said to be in equilibrium when the forces acting upon it are balanced or equal. This means that the total net force acting on the object is zero, resulting in no change in motion. In this state, an object can either remain at rest or continue to move at a constant velocity. This concept is fundamental in physics and is crucial for understanding how objects interact with forces.

Equilibrium can be classified into two types: static equilibrium, where an object is at rest, and dynamic equilibrium, where an object is moving with a constant velocity. In both cases, the forces are perfectly balanced, which is why the object does not accelerate or change its state of motion.

Other concepts like inertia, motion, and acceleration relate to changes in an object's state, but they do not define the condition where forces are equal and balanced, which is why equilibrium is the most accurate answer in this context.