Question

What happens to the motion of an object when the forces acting on it are balanced

Answer 1

When the entire group of forces acting on an object is balanced, the vector sum  

of the forces is zero, and the effect of the group of forces on the object's motion  

is identical to the effect of no force at all. The object continues in constant uniform  

motion.  

To state the outcome of the situation in three different ways:  

-- The object's acceleration is zero.  

-- The object's velocity is constant.  

-- The object's speed and direction of motion don't change.  

The direct answer to the question is: Nothing happens to its motion.