Question

When are the forces acting on a body said to be balanced ?give an example.what type of change can the balanced forces bring about in an object?

Answer 1

Forces are said to be balanced when two equal and opposite forces acts on an object which makes net force to be zero. Balanced forces are acting means object will be rest. When unbalanced forces are acting on object it starts moving in the direction of force. Example a book kept on table has two forces gravitational force acting downwards and normal force acting upwards. As two forces are equal and opposite the net force will be zero and object remains at rest.

Answer 2

When two or more forces act on a body, and their net resultant force becomes zero along any direction, then they are said to be balanced forces.

If there are two forces, then they are balanced if they are equal in magnitude and opposite in direction.  They act along the same line.  If there are three forces balanced, they act at the same point (concurrency).

Balanced forces do not bring any change in the speed of the object.  Either the object remains at rest or travels at uniform speed.